HTML5 Mono builds stall during initialization since 3.2.4 RC 4

[ZwieBit]

Godot version:
RC5 (from RC2 on)

OS/device including version:
IntelGraphics 655, GLES2

Issue description:
When i try to test a project with html5 export settings, the site ist halted and does not respond.

Current status (>RC2)

Edit fales: after force-stopping the script

Script terminated by timeout at:
Godot/Module.then@http://0.0.0.0:8060/tmp_js_export.js:9:422409
promise callback*doInit@http://0.0.0.0:8060/tmp_js_export.js:615:21
init@http://0.0.0.0:8060/tmp_js_export.js:631:19
startGame@http://0.0.0.0:8060/tmp_js_export.js:727:11
@http://0.0.0.0:8060/tmp_js_export.html:222:12
@http://0.0.0.0:8060/tmp_js_export.html:242:5

Expected behaviour (RC1)

When i try to run the export in nginx i get the following error:
image workaround applied via #47191

Steps to reproduce:
Download Project "GUI Theming Override" and Export it to HTML5

Minimal reproduction project:
Just download "GUI Theming Override" e.g.

[akien-mga]

I can't seem to reproduce the issue, it loads fine for me in Firefox Nightly and latest Chrome stable, at least when served by Godot's localhost server (one click deploy).

[ZwieBit]

In firefox and with internal server i get a rotating loading screen which stops after some seconds.

Tried changing my settings to english.

[Faless]

When i try to run the export in nginx i get the following error:

The host is not returning the correct mime type for the wasm file.

[bruvzg]

Can't reproduce it with exports from the classic Godot editor, but it is reproducible with Mono editor (exporting non-Mono project or Mono project), macOS 11.2.3 (Chromium 91 and Firefox 86).

[ZwieBit]

Nice! Didn't test that... for me exactly the same - html5 export without mono works as expected!