fix: use pkgId to get relative path (#4957)

[meixg]

Description

solve #4957

Additional context

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What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

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• Read the Contributing Guidelines.
• Read the Pull Request Guidelines and follow the Commit Convention.
• Check that there isn't already a PR that solves the problem the same way to avoid creating a duplicate.
• Provide a description in this PR that addresses what the PR is solving, or reference the issue that it solves (e.g. fixes #123).
• Ideally, include relevant tests that fail without this PR but pass with it.

[patak-cat]

Thanks for the fix @meixg, merging after testing locally. If you would like to keep collaborating, it would be good to have another PR that adds a test case for this. See https://github.com/vitejs/vite/blob/main/CONTRIBUTING.md#extending-the-test-suite

[meixg]

Thanks for the fix @meixg, merging after testing locally. If you would like to keep collaborating, it would be good to have another PR that adds a test case for this. See https://github.com/vitejs/vite/blob/main/CONTRIBUTING.md#extending-the-test-suite

@patak-js I just added a test case for this PR, see #5549