Edit your game, go down to “Embed options”, then under “Frame options” there should be a setting called “SharredArrayBufferSupport—(Experimental).” Turning this on fixed it for me
Thanks! Yeah, that option was already ticked. I was hoping there's some other magic button somewhere. I believe it's a MacOS issue (all browsers?)—which is the only OS I have access to, so testing is tough.
I exported in Compatibility Mode and used index.html so I'm not sure what more I can do.