Destroying Mongols Bug

[ginger_hammer]

Hello,
I'm playing as the Kwarezmian on VH/VH and have had a tough time beating down the Mongols but finally have, however when I take their last settlement and return to the main screen to Occupy/Sack/Exterminate, whichever option I choose the game locks up on the egg timer. I see the event of the Mongols fleeing down the left of the screen but the game is frozen. It also look like my stack that beat the city has turned into a Mongol one as well??
Has this happened to anyone else?
Instead I made them my Vassels! Show me the money you annoying Mongols!!!

[ginger_hammer]

Forgot to mention that I'm using SS6.1 and no additional submods

[gracul]

Well, did you wait a couple of minutes after conquring the settlement?
When a faction turns horde it takes a while.

[ginger_hammer]

Yeah I waited 10mins or so and checked task manager and it said that the program was not responding so I had to end task. The mouse cursor was continuing to rotate the in-game hourglass.