CK II - [3.3.2 JIVC] Can't End War with Rebels Despite 100% Score

[Arrnea]

One line summary of your issue
[3.3.2 JIVC] Can't End War with Rebels Despite 100% Score

Game Version
3.3.2 JIVC

What expansions do you have installed?
All of the above

Do you have mods enabled?
Yes, but none that affect the checksum or Achievements.

Please explain your issue is in as much detail as possible.
I am a Cuman Nomad Khagan (Koza) and one of my Khans (Kobyak) revolted, wanting to install himself on the throne. After beating down his armies and capturing all his holdings, reaching 100% warscore in my favour, I went to try and end the war. However, none of the options to end the war (Enforce Demands, White Peace, Surrender) are available to be selected, with the game claiming that the condition "None of Kobyak's holdings are occupied by Khagan Sevenç II" is not satisfied.

Steps to reproduce the issue.
Open my save file and notice that you can't end the war with the rebellious traitor Khan Kobyak.

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[Arrnea]

Found a solution (but I should not have had to do this to defeat a revolt): conquer Khagan Sevenç II first, even though he was not at war with me.

 

[Aerotinge]

That Khagan Sevenç II had occupied Bailjar, you need to retake all foreigner occupied province before you force peace with the rebels.
The tooltip is correct. And you also have "Hostile with Khagan Sevenç II due to..." notification in the diplomatic area. Nothing bug here.

 

[Arrnea]

That Khagan Sevenç II had occupied Bailjar, you need to retake all foreigner occupied province before you force peace with the rebels.
The tooltip is correct. And you also have "Hostile with Khagan Sevenç II due to..." notification in the diplomatic area. Nothing bug here.

If this is WAI, then it's pretty dumb design that it doesn't even let me surrender to the rebels unless someone kicks out a third party.