CK II - CK2 - v2.8.3.2 SAHQ Unable to force peace because target is involved in a religious revolt

[Jarlnian]

One line summary of your issue
CK2 - v2.8.3.2 SAHQ Unable to force peace because target is involved in a religious revolt

Game Version
CK2 - v2.8.3.2 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.
Playing as Sunni Abyssinian Emperor, I am facing a revolt caused by a title revokation. The leader of that revolt is facing an internal orthodox uprising. On the warscore calculation everything appears ok. When menu is reached to force peace it mentions that it can not be done because [Orthodox uprising leader name] doesn't hold any of [Guy that is revolting against me] holdings.

Steps to reproduce the issue.
Load Save.
Try to Enforce demands on peace offer with 100% warscore and all enemy leader holdings controlled

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[Rockphed]

I'm not sure if this is working as intended, and that tooltip is cryptic as all get out, but this is fairly standard behavior. If a rebelling vassal is in another war, they cannot peace out with their lord unless no third party controls any holdings. This allows you to do things like take land from vassals rebelling against their liege: if you take a few holdings in the target before you hunt down their army, they can't just white peace with their liege to get out of losing any territory. If you instead crush their army before sieging any holdings, you run the risk of their deciding to take their chances with their liege instead of whatever horrible thing you are plotting.

The good news is that you can probably clear things up by just defeating the rebels in battle.

 

[Jarlnian]

It might be, but when he rebelled he had the same rank I had (Emperor). In the end, I attacked and eliminated the revolt, he sent me peace offer enforcing his demands and once I rejected that I could enforce my demands because warscore was 100% on my favour.
The part where the rebel tried to enforce his demands makes me think that there's actually something odd in there aside from what you mention.