What packages are OK to use with WebGL build? (Mutex.js:19 error persist)

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I posted this bug two months ago (https://www.fusetools.com/community/forums/bug_reports/fuse_0854859__webgl_build_gives_errors) and a month ago it was marked as solved. However I haven’t seen a build that has it fixed yet. So I’ll just keep on posting.

My current version is 9.6.5478 .

I tried to remove basically everything from project file and still get:

Mutex.js:19 Uncaught Uno.Exception: Feature not supported in this backend

Project file:

{
"RootNamespace":"",
"Packages": [
      //"Fuse.Animations",
     // "Fuse.BasicTheme",
     // "Fuse.Themes",
     // "Fuse.Controls",
      //"Fuse.Designer",
      //"Fuse.Drawing",
      //"Fuse.Drawing.Primitives",
      //"Fuse.Effects",
      //"Fuse.Elements",
      //"Fuse.Entities",
      //"Fuse.Gestures",
      //"Fuse.Navigation",
      //"Fuse.Shapes",
      //"Fuse.Triggers",
     // "Fuse.Reactive",
      //"Fuse.Android",
      "Fuse.Desktop",
      //"Fuse.iOS",
      //"FuseCore",
      //"Uno.Collections",
      //"Uno.Geometry"
],
"Includes": [
  "*"
]

}

And MainView.ux is just:

<App>
</App>

So is it that the fix haven’t been added yet or did it emerged again? Or what I’m doing wrong here?