Google Search Console- Somthing Went Wrong when block added

Site URL: https://samfaulkner.co.uk/london-behind%20the-scenes-photographer

I have a specific page that I have been working on samfaulkner.co.uk/london-behind the-scenes-photographer
I have it functioning pretty much how I would like, but whenever I try to get the URL inspected in Google Search Console I get a "Something went wrong message". 

However if I delete one section or a some specific blocks then it can be inspected without problem. The block that I toggle on/ off to get it to replicate the error is the one with the client logos. It is a coded block 245 lines long using iframes & vimeo content as well as images hosted on squarespace.

The block functions how i want it to and was created to replace 18 individually coded blocks.

So my questions are:

Does this matter? The page is indexed and was recently crawled. Will it detrimentally affect my SEO over the longer term? A key part of my work on this page was to optimise it for search.

Any ideas of how I can prevent this from happening? I think it concerns the sheer number of blocks I have on the page. Each image in the portfolio section is coded with a lightbox effect. 

So... should I care and if yes, what do I do?
 

Could be caused by an error in the code. Can you share it to be checked?

It may not have an impact on SEO, but if there's something causing GSC not to read the page when requested, then you may lose the indexing.

Thank you.

As requested, here is the code.
I suspect it is not the code as I was getting the error with the 18 individual blocks too. The error started when I coded all the portfolio photographs in the section below to avoid using a gallery or image blocks. 
These blocks themselves do not cause the problem because if I delete the section with the client logos the error does not happen. If I add more coded image blocks to the portfolio section I can even without the logo section on the page I can recreate te issue.
I think it might be down to there being some sort of limit on the number of blocks on a page or something like that, but it doesn't make much sense.
In the next message, I will post an example code for one of the image portfolio blocks. Keeping it separate for clarity
 

<div class="client-container">
  <!-- Logo 1 -->
  <div class="client-block">
    <img src="https://images.squarespace-cdn.com/content/v1/6273f2c1e8a83f01f0951283/d1b632c0-662e-452e-b4df-f8edfaea2be7/Dolce-%26-Gabbana-film.png" 
         alt="Dolce & Gabbana logo" 
         class="client-logo">
    <div class="client-overlay">
      <img src="https://images.squarespace-cdn.com/content/v1/6273f2c1e8a83f01f0951283/2d62b171-512b-423c-afbf-7a3b3ae459f5/dolce-gabbana-scarlett-johansson.jpg" 
           alt="Scarlett Johansson posing behind the scenes for Dolce & Gabbana">
    </div>
  </div>

  <!-- Logo 2 -->
  <div class="client-block">
    <img src="https://images.squarespace-cdn.com/content/v1/6273f2c1e8a83f01f0951283/1f9d0030-37e6-43fd-9b88-222d5126f0e4/Revlon-Logo-BTS.png" 
         alt="Revlon Lip Plumping TV commercial logo" 
         class="client-logo">
    <div class="client-overlay">
      <iframe title="Beauty BTS Revlon Lip Plumping TV Commercial" 
              src="https://player.vimeo.com/video/748861106?background=1&autoplay=1&loop=1&title=0&byline=0&portrait=0" 
              style="position:absolute;top:0;left:0;width:100%;height:100%;" 
              frameborder="0" 
              allow="autoplay; fullscreen" 
              allowfullscreen>
      </iframe>
    </div>
  </div>

  <!-- Logo 3 -->
  <div class="client-block">
    <img src="https://images.squarespace-cdn.com/content/v1/6273f2c1e8a83f01f0951283/4d35ae4c-55f7-4f87-8158-f0832e51159e/Vogue-fashion-films.png" 
         alt="Vogue Italia Fashion Film featuring black leather bikers" 
         class="client-logo">
    <div class="client-overlay">
      <iframe title="Fashion Behind the Scenes - Vogue Italia Fashion Film" 
              src="https://player.vimeo.com/video/748807464?background=1&autoplay=1&loop=1&title=0&byline=0&portrait=0" 
              style="position:absolute;top:0;left:0;width:100%;height:100%;" 
              frameborder="0" 
              allow="autoplay; fullscreen" 
              allowfullscreen>
      </iframe>
    </div>
  </div>

  <!-- Logo 4 -->
  <div class="client-block">
    <img src="https://images.squarespace-cdn.com/content/v1/6273f2c1e8a83f01f0951283/762b46a9-78d5-43c7-9f48-8e6a3ab299c6/hugo-boss-lewis-hamilton-bts.png" 
         alt="Hugo Boss logo" 
         class="client-logo">
    <div class="client-overlay">
      <iframe title="Hugo Boss Behind the Scenes with Lewis Hamilton" 
              src="https://player.vimeo.com/video/748936323?background=1&autoplay=1&loop=1&title=0&byline=0&portrait=0" 
              style="position:absolute;top:0;left:0;width:100%;height:100%;" 
              frameborder="0" 
              allow="autoplay; fullscreen" 
              allowfullscreen>
      </iframe>
    </div>
  </div>

  <!-- Logo 5 -->
  <div class="client-block">
    <img src="https://images.squarespace-cdn.com/content/v1/636caaab9af77d37f83acbe4/2f135d3b-2eb6-4974-901c-f940ef62287f/Gucci-logo-digital-content.png" 
         alt="Gucci Logo" 
         class="client-logo">
    <div class="client-overlay">
      <img src="https://images.squarespace-cdn.com/content/v1/6273f2c1e8a83f01f0951283/9f9c856e-0b02-4b81-9de6-8fbc9faa9bdb/040_Gucci-jewellery-film.jpg" 
           alt="Gucci behind the scenes" 
           style="position:absolute; top:50%; left:50%; transform: translate(-50%, -50%);">
    </div>
  </div>

  <!-- Logo 6 -->
  <div class="client-block">
    <img src="https://images.squarespace-cdn.com/content/v1/6273f2c1e8a83f01f0951283/c8d7dd13-b8f5-4433-a834-9f733b826dca/Versace-behind-the-scenes.png" 
         alt="Versace Logo" 
         class="client-logo">
    <div class="client-overlay">
      <img src="https://images.squarespace-cdn.com/content/v1/6273f2c1e8a83f01f0951283/9c51ac51-abae-45d4-979d-ce806415267a/Versace-BTS.jpg" 
           alt="Versace behind the scenes photographer shot in London">
    </div>
  </div>
</div>

<div class="client-container">
  <!-- Logo 7 -->
  <div class="client-block">
    <img src="https://images.squarespace-cdn.com/content/v1/636caaab9af77d37f83acbe4/3c5368b6-dcbf-4002-a2fa-e909bdcffb4a/Kerastase-advert-logo.png" 
         alt="Kerastase TV advert with Kate Moss" 
         class="client-logo">
    <div class="client-overlay">
      <iframe 
        title="Kerastase TV Advert featuring Kate Moss" 
        src="https://player.vimeo.com/video/748918678?background=1&autoplay=1&loop=1&title=0&byline=0&portrait=0" 
        style="position:absolute;top:0;left:0;width:100%;height:100%;" 
        frameborder="0" 
        allow="autoplay; fullscreen" 
        allowfullscreen>
      </iframe>
    </div>
  </div>

  <!-- Logo 8 -->
  <div class="client-block">
    <img src="https://images.squarespace-cdn.com/content/v1/636caaab9af77d37f83acbe4/bf6bb8e7-6d0b-4cee-b293-3bb58ae46f35/Decorte_kate-moss.png" 
         alt="Decorté logo" 
         class="client-logo">
    <div class="client-overlay">
      <iframe 
        title="Decorté Behind the scenes content featuring Kate Moss" 
        src="https://player.vimeo.com/video/748861166?background=1&autoplay=1&loop=1&title=0&byline=0&portrait=0" 
        style="position:absolute;top:0;left:0;width:100%;height:100%;" 
        frameborder="0" 
        allow="autoplay; fullscreen" 
        allowfullscreen>
      </iframe>
    </div>
  </div>

  <!-- Logo 9 -->
  <div class="client-block">
    <img src="https://images.squarespace-cdn.com/content/v1/6273f2c1e8a83f01f0951283/84672a4d-2194-44fe-b1c1-b03b0373a115/stefanel-BTS-logo.png" 
         alt="Stefanel Logo" 
         class="client-logo">
    <div class="client-overlay">
      <img src="https://images.squarespace-cdn.com/content/v1/6273f2c1e8a83f01f0951283/3b1a30cc-530c-4dfb-9adb-28a2b157b56c/Stefanel-behind-the-scenes.jpg" 
           alt="Stefanel behind the scenes photos with Gisele">
    </div>
  </div>

  <!-- Logo 10 -->
  <div class="client-block">
    <img src="https://images.squarespace-cdn.com/content/v1/6273f2c1e8a83f01f0951283/979c8183-ecbf-4920-90b3-fe8d6f17d509/estee-lauder-behind-scenes.png" 
         alt="Estee Lauder logo" 
         class="client-logo">
    <div class="client-overlay">
      <img src="https://images.squarespace-cdn.com/content/636caaab9af77d37f83acbe4/127447cc-47a5-4abf-9df3-8bffe9e4823d/Estee-lauder-BTS-Ibiza.jpg" 
           alt="Estee Lauder behind the scenes pictures">
    </div>
  </div>

  <!-- Logo 11 -->
  <div class="client-block">
    <img src="https://images.squarespace-cdn.com/content/v1/6273f2c1e8a83f01f0951283/a93415e4-e70d-4761-911b-65d18c59ec80/jimmy-choo-film-logo.png" 
         alt="Jimmy Choo logo" 
         class="client-logo">
    <div class="client-overlay">
      <img src="https://images.squarespace-cdn.com/content/v1/6273f2c1e8a83f01f0951283/861d56cf-ea11-41e4-b3a0-1c77c3c6ff2d/Jimmy-Choo-BTS.jpg" 
           alt="Jimmy Choo BTS film with Nicole Kidman" 
           style="object-fit:contain;width:100%;">
    </div>
  </div>

  <!-- Logo 12 -->
  <div class="client-block">
    <img src="https://images.squarespace-cdn.com/content/v1/6273f2c1e8a83f01f0951283/52b4db39-2884-4896-b9e2-69939766fc00/haig-club-beckham-bts.png" 
         alt="Haig Club Logo" 
         class="client-logo">
    <div class="client-overlay">
      <img src="https://images.squarespace-cdn.com/content/6273f2c1e8a83f01f0951283/c8be89f3-c9bf-4a60-9905-ac54af8678e3/haig-club-david-beckham-bts.jpg" 
           alt="Haig Club behind the scenes photographer with David Beckham">
    </div>
  </div>
</div>

<div class="client-container">
  <!-- Logo 13 -->
  <div class="client-block">
    <img src="https://images.squarespace-cdn.com/content/v1/636caaab9af77d37f83acbe4/8a6547df-4bfc-4f17-bee5-f77242f819b9/covergirl-online-film.png" 
         alt="Katy Perry CoverGirl Makeup BTS reveal film" 
         class="client-logo">
    <div class="client-overlay">
      <iframe 
        title="Katy Perry CoverGirl Makeup Reveal behind the scenes Film" 
        src="https://player.vimeo.com/video/748861090?background=1&autoplay=1&loop=1&title=0&byline=0&portrait=0" 
        style="position:absolute;top:0;left:0;width:100%;height:100%;" 
        frameborder="0" 
        allow="autoplay; fullscreen" 
        allowfullscreen>
      </iframe>
    </div>
  </div>

  <!-- Logo 14 -->
  <div class="client-block">
    <img src="https://images.squarespace-cdn.com/content/v1/6273f2c1e8a83f01f0951283/c1bc2ef6-db77-4576-814e-b1ef4e0f8ff7/Shiseido-behind-scenes.png" 
         alt="Shiseido logo" 
         class="client-logo">
    <div class="client-overlay">
      <img src="https://images.squarespace-cdn.com/content/v1/6273f2c1e8a83f01f0951283/5a478bc1-a487-4f06-9b6f-c422bfede55a/015_Shiseido+behind+the+scenes.jpg" 
           alt="Shiseido behind the scenes beauty shoot London" 
           style="object-fit:contain;width:100%;">
    </div>
  </div>

  <!-- Logo 15 -->
  <div class="client-block">
    <img src="https://images.squarespace-cdn.com/content/v1/6273f2c1e8a83f01f0951283/61f3453b-6778-4d63-8e8f-0d8e94794a70/liu-jo-fashion-film.png" 
         alt="Liu Jo Logo" 
         class="client-logo">
    <div class="client-overlay">
      <img src="https://images.squarespace-cdn.com/content/636caaab9af77d37f83acbe4/d543bae1-e7e5-4e90-bd4a-b84b92769ea9/kate-moss-liu-jo-bts.jpg" 
           alt="Liu Jo behind the scenes photos with Kate Moss">
    </div>
  </div>

  <!-- Logo 16 -->
  <div class="client-block">
    <img src="https://images.squarespace-cdn.com/content/v1/636caaab9af77d37f83acbe4/cf9f8d1f-e085-43b5-845e-1104e579a9ca/Stella-McCartney-Adidas-film.png" 
         alt="Stella McCartney x Adidas fashion film director" 
         class="client-logo">
    <div class="client-overlay">
      <iframe 
        title="Stella McCartney x Adidas Fashion Film" 
        src="https://player.vimeo.com/video/748861194?background=1&autoplay=1&loop=1&title=0&byline=0&portrait=0" 
        style="position:absolute;top:0;left:0;width:100%;height:100%;" 
        frameborder="0" 
        allow="autoplay; fullscreen" 
        allowfullscreen>
      </iframe>
    </div>
  </div>

  <!-- Logo 17 -->
  <div class="client-block">
    <img src="https://images.squarespace-cdn.com/content/v1/6273f2c1e8a83f01f0951283/1257916e-ff05-4df3-8744-1f62db15c81f/Burberry-bts.png" 
         alt="Burberry logo" 
         class="client-logo">
    <div class="client-overlay">
      <img src="https://images.squarespace-cdn.com/content/636caaab9af77d37f83acbe4/67e00b35-e874-4d2a-b02d-b36e646f7999/Burberry-BTS-Photographer.jpg" 
           alt="Burberry Behind the scenes photographer fashion shoot London">
    </div>
  </div>

  <!-- Logo 18 -->
  <div class="client-block">
    <img src="https://images.squarespace-cdn.com/content/v1/6273f2c1e8a83f01f0951283/045e76ac-4fc3-4bf9-a37d-1c6d72ae3472/Michael-Kors-bts-logo.png" 
         alt="Michael Kors logo" 
         class="client-logo">
    <div class="client-overlay">
      <img src="https://images.squarespace-cdn.com/content/6273f2c1e8a83f01f0951283/cbbca56a-0d00-41e4-8dce-5ded57d3d241/Michael-Kors-BTS.jpg" 
           alt="Behind the scenes Mario Testino shooting Michael Kors California">
    </div>
  </div>
</div>

Here is the example code for one of the portfolio image blocks. There are 33 or so of these on the page. I have reduced that number from 50.

Could it be that this page is just too heavy?
 

<div class="portfolio-item">
  <a href="#lightbox_london-behind-the-scenes-photographer_block-yui_3_17_2_1_1731170147340_13056" aria-label="Behind the scenes Photographer" style="position: absolute; top: 0; left: 0; width: 100%; height: 100%; z-index: 5;">
    <div class="portfolio-image-container">
        </a>
      <img src="https://images.squarespace-cdn.com/content/636caaab9af77d37f83acbe4/45201a3b-5473-461a-b179-85a6fecc93a7/behind-the-scenes-photographer-01-01.jpg" 
           alt="Behind the Scenes Photographer" 
           title="Behind the Scenes Photographer" 
           loading="lazy" />
    </div>

  
  <div class="portfolio-overlay">
      <h3>Michael Kors</h3>
      <h4>LOCATION BTS</h4>
  </div>
</div>

7 minutes ago, SnapperGB said:

I think it might be down to there being some sort of limit on the number of blocks on a page or something like that, but it doesn't make much sense.

I can't imagine that the block number matters in this case.

I can't see any major problems with your code either. Hard one to test, but by elimination might work, keep a copy of the page saved, and remove elements testing in between until the problem resolves.

Thank you.

That is pretty much what I have been trying to do. I am reluctant to start removing too many of the image portfolio blocks are they each have block reference specific code ( eg: a href="#lightbox_london-behind-the-scenes-photographer_block-4a92e746ef990ffd5e3f)  and this would entail redoing every one I remove. Similarly if I remove the section, even if I save it as a template all the block numbers will change and need recoding.

Thanks for your time. 

3 minutes ago, SnapperGB said:

Similarly if I remove the section, even if I save it as a template all the block numbers will change and need recoding.

Yes, that's a major drag, and it's far from an ideal solution. Sorry I haven't got a better suggestion.