Another thing that I’ve seen not working in Godot 4 games is the “View random submissions” button on jams. I haven’t used that button a lot recently, so I don’t know if it’s been fixed in the meantime, but last time I submitted a game to a jam and played some random submissions there was at least one game that didn’t work until I opened its submission page in a new tab and then opened the game page in that tab.
Edit: I just tried using it, and it showed the following text:
Error The following features required to run Godot projects on the Web are missing: Cross Origin Isolation - Check web server configuration (send correct headers) SharedArrayBuffer - Check web server configuration (send correct headers)
whereas the same game, if I control-click the submission to button and then go back to the game in the new tab it works fine.