It is enabled. Here is where I found out why we should have all been using godot 3 instead of 4. 4 forces us to use this experimental setting on itch for the SharedArrayBuffer. While for the most part folks aren't having a problem, I've been seeing the occasional issue pop up like this on some other projects where even though its enabled, the error is still occurring for some people, primarily those using FireFox. I'm sorry you weren't able to play due to this and hopefully it's a problem that's dealt with soon.