CK II - Papal States became kingdom of romagne event does not trigger

[LordCesare]

One line summary of your issue
Papal States became kingdom of romagne event does not trigger

Game Version
3.0.1.1(ONDO)

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.
After the pope lost all his territory inside the de jure kingdom of papal states, there should be a event make him lose the kingdom title and change the name of the de jure kingdom. However, in my latest play, I took over all the county the pope owns directly, while republic of ancona is his vassle. After the peace treaty, Ancona broke free from the papacy and the pope do not own or vasslize any landed title. However, the event does not trigger, and since I was playing Byzantine empire, there's no way to usurp the kingdom.

Steps to reproduce the issue.
1.pope directly own few county and vassalize a merchant republic
2.declear war in order to take over all the county pope directly owns
3.sign the peace treaty, the republic break free and the event does not happen

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[LordCesare]

And please change the trigger whenever the system detect the pope does not own land in the area.
I REALLY don't want to restart a 60 hour play just because you guys made imperial system unable to usurp kingdom title(and this really don't make sense....).