[1.2.1] Three capital worlds after faction rebellion

[Oaden]

So i declared war on my neighbour for two planets, i win the war and claim the planets as my own. Pop is xenophobic so they're unhappy and a faction that demands to return to their former empire emerges and rapidly gains support

In anticipation of the rebellion i station armies on the two planets. The support reaches 100%. I get the prompt that the faction does its thing and....

Nothing happens, the faction disappears, and both worlds are now suddenly captital worlds, with the 10% happyness buff and border extension and everything.

Also it randomly gave me the achievements for having three vasals.

I've included the save game.

 

[Polymeron]

I can confirm I've had the same issue (with a single planet) on v1.2.0 with a repatriation faction. Basically the game both fails to create the actual rebellion, and is too quick to set the Capital World modifier (not sure why it does that manually - it should be a result of a new nation being formed that lacks a capital, not a direct consequence of faction action). Also possibly the game is too quick to disband the faction (though that might be as intended - I'm not sure as I've never had a successful faction before that).

Interestingly, the population then joined a new planet separatist faction, instead. Almost as if they forgot their previous affiliation as a result of this bug.
I'm including the save file.

 

[Vind7]

I got multiple vassal joins war messages upon rebellion and nothing happened at all.I got no vassals at all.

 

[Loskit]

same thing here with v1.2.1.
Well I found it pleasant...

 

[oprex]

Are they not fixing this bug? I've had it happen to me as well. No replies from anyone at the company?