Update: Bei uns betrifft das "nur" DFS Shares.
Hier eine Beschreibung in EN, wie das funtkioniert mit dem EnableLinkedConnections:
After you enable EnableLinkedConnections parameter of the registry, LanmanWorkstation and LSA will check if there is the second access token associated to the session of the current user. If this token is found, the list of the mounted network drives will be copied from one token to another. Thus, the network drives mounted elevated will be seen in the standard mode, and vice versa.