The default welcome view of the plugin is not displayed

[helloworldmygithub]

Bug Description:

Steps to Reproduce:

1. Run start theia
2. Download the installation package in the vscode plugin market eg: https://marketplace.visualstudio.com/_apis/public/gallery/publishers/rohinivsenthil/vsextensions/postcode/1.3.9/vspackage
3. Install from VSIX
4. The plugin doesn' have a welcom view to create request, in vsocde it works

Additional Information

• Operating System:
• Theia Version:

[helloworldmygithub]

I am trying to solve this problem https://github.com/eclipse-theia/theia/pull/12466

[helloworldmygithub]

I have submitted the code and it can solve the problem, but perhaps someone else has a better solution

[msujew]

I'll close this issue in favor of https://github.com/eclipse-theia/theia/issues/9361.