-e: when trying to have your build served from the built-in webserver it fails when WASM streaming is enabled

-repro:
--open attached project/create new one
--enable WASM streaming in player settings
--make sure Development Build is unchecked
--Build&Run WebGL
--NOTICE that the build fails to run in the brower and errors are logged into the console
---wasm streaming compile failed: TypeError: Response has unsupported MIME type
---falling back to ArrayBuffer instantiation
---failed to asynchronously prepare wasm: CompileError: wasm validation error: at offset 4: failed to match magic number
---CompileError: "wasm validation error: at offset 4: failed to match magic number"