There are four users (1), (2), (3), and (4). Credentials are synchronized with active directory by application linked Jira DC instance. All these users a member of confluence-users group. However, inspect permissions reveals that users (1) and (4) cannot view space whereas users (2) and (3) can. How come?
Note A: Some time ago, an earlier Jira (server) instance was migrated to this data center virtual machine.
Note B: Bulk edit group members in Jira does NOT list user (2).
(Jira lets know: "confluence-users have more than 200 users. These group(s) have been limited to display the first 200 users only." User (2) should definitely be listed among them - but it is NOT. Besides, trying to add user (2) to group confluence-users fails: "Cannot add user (2), user is already a member of 'confluence-users')

