I would love a save or steps to reproduce this, because disinheriting an heir is blocked (or supposed to be blocked) during a regency.
View attachment 221620
Seems like I stumbled onto some strange fringe-case bug. I thought I had saved before I tried dinheriting but this save seems to be gone and I wasn't able to replicate right know. I have some proof though that I'm not pulling things out my ****.
In the first picture you can see glorious Caterina Visconti ruling over Austria. The name is a giveaway that she was married away from Milan. You can also see that she has an heir, who IS of age and a Habsburg. He was only born after I disinherited.
In the second picture you can see how Catarina supposedly ruled since she was married in the month after game's start which is not possible because more than fifthteen years have gone by.
Mod-wise im running only:
50 loading screens mod
Colonial CB Restoration (My own mod, but it only changes 00_cb_types.txt)
East asian advisor portrait mod
tbarw extra: darker water
I could swear I made made a save before I tried, but it's just not there.
Anyway here's the only save I got left of this game, and I don't think it will be of much help, sadly.