CK II - Can't Join Pope's War Because the Game Says He's My Vassal

[junassa]

One line summary of your issue
Can't Join Pope's War Because the Game Says He's My Vassal

Game Version
3.2.2

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.
the Pope is being attacked by the Western Protectorate. I want to help him but the option is grayed out. It says he's my vassal but he isn't.

Steps to reproduce the issue.
Not sure what's causing the problem to be honest.

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[lozikk]

Damn that Western Protectorate is thicc


I believe the reason of this is Knights Templar involved in the war, who are your vassals and the game thinks that this is "their" (holy order's) war