Now those lines appear instead:
Downloading engine...
failed to asynchronously prepare wasm: CompileError: wasm validation error: at offset 58326: expected function bodies
The game aborted unexpectedly.
More information may be available in the browser console or contained in the log.
Aborted(CompileError: wasm validation error: at offset 58326: expected function bodies)
The background shows "now" loading & some chinese/japanese/korean/etc. lines?