Yes, I'm still having unfortunately.
And, no mods.
First of all, i gave up siegeing the castle after a few tries, but when my vassals sieged the castle, same crash happened a few times, so i made peace with them and continued my gameplay. my kingdom took a few castles from another kingdom while im having no crashes and after 1-2 hours of gameplay, game crashed again. when i looked at my vassals none of them seemed like sieging something. other kingdoms cause that too probably i dont know.
I'm having crashes in this save after running like 2 seconds every time.
drive.google.com