Import between different Team Projects in AE not working

Hey folks,

My team collaborates via Team Project in AE, and over time it grew quite huge. Been trying to break it down  into few smaller Team Projcts by:

1. Creating new Team Project

2. Importing part of main Team Project into new Team Project via Media Browser

3. Assets and comps appear in new Team Project, but Share Changes icon is disabled. That's the issue, I've been trying few things:
- if I close project at this point, everything imported doesn't get saved, no modal asking to Sync

- if I try to edit imported files, Sync ignorrs it

- if I create new comp or folder in master directory, then Share Changes icon is active, but only for new created stuff, it continues to ignore import

- if I create new comp or folder in imported folder, it's not recognised

- recreating same flow with brand new Team Project just to insure it's not project releted

Obviously it's a bug, would appreciate help with it!

Also would love to hear some suggestions on how do you collaborate within your teams! Do you use Team Projects and how (our workflow is mostly 2D/3D motion, so Premier doesn't cut it)? Do you use local projects share between collaborators via Creative Cloud Files, etc?