CK II - [2.8.3.2 SAHQ] Viceroy stuck in endless revocation cycle

[shulima]

One line summary of your issue
[2.8.3.2 SAHQ] Viceroy stuck in endless revocation cycle

Game Version
2.8.3.2 (SAHQ)

What expansions do you have installed?
All of the above

Do you have mods enabled?
No

Please explain your issue is in as much detail as possible.
My vassal, Viceroy of Transoxiana, is endlessly revoking and granting the county of Khiva. He grants the county and revokes it a couple weeks later. Then grants it to someone else and revokes a couple weeks later. He's done it seven times already and doesn't look like he's about to stop.

He's not a lunatic either. Looks like a weird bug to me.

Steps to reproduce the issue.
Load the game and watch what happens to Khiva.

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[Aardvark Bellay]

I had similar things happen in my current game.
There my viceroy king was revoking several vassals one after another in his capital duchy.
Not the dejure capital county by the way, as in your case. That was held by the king without change.
After successfully revoking, another guy got the county and the circle repeated.
At one point he stopped, but i couldn't identify why nor why he started it.
His demesne limit was also reached, so he had no reason to get another title.