Activating license rendered channels unusable

After activating our professional license, channels previously synced with ldap groups (we were on the enterprise trial license) are now unusable.

Steps to reproduce

  1. go on enterprise trial license
  2. configure ldap/ad group sync
  3. create channel with group sync
  4. switch to professional license
  5. try to change channel members (will no be possible)

Expected behavior
either keep functionality for already configured channels and groups or disable sync and free groups and channels for manual management.

Observed behavior
can no longer add or remove members from channels that were previously synced from ldap group, same goes for group memberships.