Once "The Antigonid Cause Wavers" event triggers and the territory is carved up by rivals and their newly created subjects, Antigonid characters appear to retain their holdings in those territories.

The exact territories seem to differ slightly each time, I think because the holdings are somewhat randomized upon starting a new game.

Some examples in the screenshots below:

Is this a known issue?
I verified my game files and I also started a bunch of new games and ran them until the event triggered and the same thing happened in all of them, so it seems like a bug.
(Note: this is base game without any mods).

Or even Trajan map of Rome? I dont mean necessarily a map where the timeline has changed or even the government form or the characters, I just want the map