Group API shared_with_groups missing results

I noticed some strange behaivor with the Group API

When I request a group details, shared_with_groups didn’t list all relations to others groups. I configured through UI many of them but API response don’t get all.

However if I try to recreate this missing relations through API, obviously, already exists
409 {message: Shared group The group has already been shared with this group}

Are there any consideration to this behaivor?