I know about the SharedArrayBuffer, what's strange is that I've had this option enabled since I first uploaded the game to Itch, so I'm not sure what could be the problem for AntWal...
I think I've found the problem, Godot Web projects give that error when the user is viewing it though the Game Jam Random Submission feature. doing random submissions right now and seeing a few Godot projects with that same error, but it works fine if I open the game page without using the View Random Submission.