Members of a location are displayed correctly on the View Pane under All Members field.
But there is nothing under Location Properties > Associations > Has Members
Add ( create if it's not there ) the registry key MaxRowCountForConnectedRowSet
DWORD type with value 10000 or more
HKEY_LOCAL_MACHINE\SOFTWARE\Micro Focus\Content Manager\WorkgroupServers
to the Workgroup Server and have it restarted.
This is related to buffering and is addressed in CM 9.4 Patch 2 onward as part of OCTCR6J340016