I think that might be it, I'm on Windows 11, but I ran it on my Macbook and the bar was working fine!
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Funnily enough, I was actually expecting the exact opposite of that. I remember seeing some older versions of godot 4 had issues with web exports on Mac, so I assumed some of the issues were still there and you were playing on Mac. It's weird that it worked on Mac but not windows. Either way, thanks for helping me figure out what the problem was!