fix: issue where imported sources were missing from verification JSON

[antazoey]

What I did

Noticed imported sources were missing during verification. This fixes that... but still having an issue with verification, so investigating yet.

How I did it

How to verify it

Checklist

• [ ] Passes all linting checks (pre-commit and CI jobs)
• [x] New test cases have been added and are passing
• [ ] Documentation has been updated
• [ ] PR title follows Conventional Commit standard (will be automatically included in the changelog)