Predefined Extensions in theiaPlugin are not loaded when launched in Browser, but used to work in 1.40.0

[KarthikHebbarMN]

I have mentioned some packages in theiaPlugins in applications/browser/package.json

and as well as in package.json in root folder according to a change in 1.41.0

"theiaPlugins": {
    "vscode-builtin-extensions-pack": "https://open-vsx.org/api/eclipse-theia/builtin-extension-pack/1.77.0/file/eclipse-theia.builtin-extension-pack-1.77.0.vsix",
    "muhammad-sammy.csharp": "custom load location/csharp-1.26.0.vsix",
    "jsw.csharpextensions":"https://open-vsx.org/api/jsw/csharpextensions/1.7.3/file/jsw.csharpextensions-1.7.3.vsix",
    "bc.portexposer":"custom load location/bcportexposer-0.0.1.vsix"
  },

These plugins were installed and loaded in the previous blueprint browser version. But in latest one it seems to not load at all and nor provide any details as to why its failing. I am trying this inside Docker browser build.