Since the update, now showing a red warning sign on my beacon as having 6d instead of the ~23w it was last night.
Edit: Okay it’s a bit more complex than that. If an alt logs in, the shows as not applied to other beacons on other characters. However if you log in on the character that owns the beacon with the warning, it shows as fuelled for GC membership length again.
Seems to happen across any alt - if you’re on character A and have permissions on character B’s beacon and it shows in your beacon list, you get the red !, the flashing beacon icon and the warning. When you switch to that beacon owner, all seems well.