[Bug]: VSCode language service incorrectly reports error with @tagMetadata

[pschaeflein]

Describe the bug

Below is a screenshot of VSCode. The Problems panel reports that @tagMetadata must be used on the service namespace. This is incorrect.

The OpenAPI emitter correctly includes the metadata.
Running tsp compile does not show errors.

The VSCode extension is version 0.64.1.

The errors show in the Problems panel only when the file containing the decorator is opened.
The errors also show in the terminal window for when running the auto-discovered task (From the "contributed" section of the VSCode command bar.)
The order of the tags does not matter (tagMetadata/service).

Related discussion: #3777 (comment)

Reproduction

Bug is in VSCode extension, not playground.

Checklist

• Follow our Code of Conduct
• Check that there isn't already an issue that request the same bug to avoid creating a duplicate.
• Check that this is a concrete bug. For Q&A open a GitHub Discussion.
• The provided reproduction is a minimal reproducible example of the bug.

[RodgeFu]

@mzhongl524 , could you help to do a quick investigation why the error only appears in vscode? thanks.