If a content type has automatic path aliases, imported content gets an alias even if it was saved as no alias

That's an interesting issue; the pathauto setting is not stored as entity field, so it's not exported directly.
However we do have some special handling for it in the Node entity type base field processor plugin:
https://git.drupalcode.org/project/single_content_sync/-/blob/1.4.x/src/...
This code is in 1.4.x (2.0.x is currently outdated).

mlncn, can you please check if this is still happening with 1.4.x?

Thanks!

I made the same code for taxonomy term and media.
It works on my side - but need additional checks.

For version 1.4.5 - need to check.