Verify the CRUD permissions for those groups in /useradmin console.Also
check their ACLs in crx, if it's specific to any node.These might help
figure out the reason.
Thank you for waiting and per this release documentation:
https://docs.adobe.com/content/help/en/campaign-standard/using/release-notes/release-planning.html
Release 20.2.1 is scheduled for March 30 - April 06, 2020.