Do you have a save file of session that you experienced this issue? With your save file, we can reproduce the issue much easier and faster. For more information regarding how to send us your save files, you can check this thread
out. You can find your save file here:
C:\Users\username\Documents\Mount and Blade II Bannerlord\Game Saves
You can send your save files to us via upload.taleworlds.com
site. Please write your username and this threads URL into the description box so that we can find it easier. Thanks for reporting and sorry for any inconvenience!