Steps to reproduce:

1. Create new map as Zabbix admin with owner Zabbix admin, select "share" and choose a user group, give them "read-only" permission.
2. That User group has a user role type "user".
3. Login as a member of that group -> map editing is not possible
4. Change user role type to "admin"
5. Login as a member of that group -> map editing is possible (should not be!)

Try the same steps with a dashboard instead of a map - the user group with role type "admin" cannot edit the dashboard. This is the expected result, but not in the maps section.