Could you upload your save file to upload.taleworlds.com so that we can reproduce the issue faster. You can find the save file here:
C:\Users\username\Documents\Mount and Blade II Bannerlord\Game Saves
Please include the link to this thread in the description box on the upload website so I can identify it.
I have been informed that this issue is fixed on our development branch and the fix will be implemented with the upcoming patches. Thanks for reporting!