Suggest an idea for Knip

I ran into a problem while using knip detection in a monorepo project.
Let me give you an example:
The project comprises two sub-packages, app and infrastructure, where app relies on infrastructure's baseMethod.
When I import the baseMethod() from '@infrastructure/lib/base' in app and run 'knip --production', the file 'packages/infrastructure/lib/base.ts' is flagged as unnecessary.
But when I import the baseMethod from 'infrastructure/lib/base', knip correctly identifies 'packages/infrastructure/lib/base.ts' as a necessary file. I'm wondering, why does the presence of the '@' symbol cause this misidentification?
Here's the layout of the project structure.

Can you assist me? Could there be an issue with how I'm using knip?