@paul2009 O sorry, my bad! The URL is https://www.wandertowonder.nl.
The weird thing is that I have another website with squarespace (https://www.esmeefranken.com), which I must say is much older then the one above. But that one does show the favicon in Google and I've changed that file to a new one in the past 7/8 months I guess. Funny thing: that file doesn't meet the 48, 96 or 144 pixel rule (the image I used for that is 32 pixels long, I just checked). But it worked apparently.