I have experienced the same issues on Xbox Series X and the issues appear more often as the time goes by. I am playing with mouse and keyboard since I come from PC gaming and it is hard for me to adapt to controller. I saw in some post that a guy said they don't officially support mouse and keyboard on Xbox but Xbox has the tag with Mouse and Keyboard on the game description so I don' t understand what to believe anymore. This game is the main reason why I bought an Xbox + the fact that I can use mouse and keyboard. The game crashes in 2 cases for me from what I noticed so far: 1. when I press button Ready in a field battle (mostly fighting bandits but I didn't fight so many nobles yet) after deploying my troops in the desired position. In this case the battle starts because I can see my character on the field but the game freezes and after 5 seconds it closes automatically and I have to open again. I noticed that when the battle starts the crosshair is looking straight up at the sky and I have to adjust with mouse to see the horizon. The game crashes in this stage when I am trying to adjust the crosshair in order to view the horizon/enemy line. I usually try to adjust the crosshair as soon as possible so I start moving my mouse right after I press Ready. 2. when I select Lead an assault option after the siege preparations are ready. In this case the loading bar is stuck at about 75% and the game does not respond so I have to press the xbox button on controller several times and after a few seconds the game is automatically closed and I have to open the game again but I tried to Lead an assault several times after restarting but same behaviour. The town was Amprela. Later in the game I was able to Lead an assault on Quiaz but for Amprela I had to give up.
Another anoyin thing I noticed: when trading with a town, when I select an item from my inventory that respective item is not automatically highlighted in the inventory of the town but there is some automatically scrolling done on the town inventory just that it does not scroll to the right item in the list so I don't know how much qty available in town. I am not happy with the game so far, it has too many bugs, it is not stable. I hope someone reads this and maybe can tell me if they will at least try to fix the issues.