If you right click on the video in Youtube and click copy video URL, it will do so without the short format and then you can add to Squarespace.
This worked for me! To clarify: from your YouTube dashboard, click "View on YouTube" on your video, and then right-click the video to pull up the following options. Click "Copy video URL" and then paste the URL into the Video Block in Squarespace.
Youtube shorts URL not working
in Customize with code
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This worked for me! To clarify: from your YouTube dashboard, click "View on YouTube" on your video, and then right-click the video to pull up the following options. Click "Copy video URL" and then paste the URL into the Video Block in Squarespace.