Hello there! I also have exactly the same issue! And I was digging in to that almost 2 days. I have this problem on the cloud gaming Virtual machine desktop. I've been using 3 different online services (Paperspace, Parsec and Loudplay), and all of them have exact the same issue. So it should be somewhere by the mouse synchronization issue. Other games on all those 3 cloud platform are working fine! So here is some information that I've gathered during the time by trying to solve this. In my cases (all 3 platforms) you can see the in game cursor but it is responsible to click only upper left part of the screen. Like if you separate the screen on 4 squares, only the top left one would have a clickable area. That happens on all platforms. Interesting fact is, that it's actually possible to click something on different area by moving the mouse very fast from the "working" area to another. It happens not every time, but it works. Of course that way is not playable. Now lets move to the cloud platform information that I've gatheredthrue my experiments. the 1st one is Paperspace. If you star the game with native papaerspace VM app setting, it has the same mouse issue. But there is a option that you can turn on in advanced setting called "USB mouse emulation".With this option the mouse becomes the right behaving and you can click on everything. However, in battle mod, it cause a lot of lags, and strange mouse movings. There is also gamer mode that you can switch on, but that also don't really helps. In Parsec you get a very good battle experience, how ever, you can't click anything out side the "working" square. (I had to jump from Parsec app to running on chrome Paperspace VM client to use it only for mouse moving outside the battle) So the next one is Loudplay. It's located in Moscow. It also has the same issue with mouse, and the same size of the "working" square, however, it has a Wonderfull option: detach the mouse from game by just clicking the hot keys. When the mouse is detached - everything turns to clickable, but same time the cursor is gone. So I using the hot keys to switch those mouse modes (every 10-15 seconds) to navigate the mouse. I've contacted every support on each platforms and they all said that it should be a game issue, couse almost all other games are working fine. As I know, another great gaming online platform "Playkey.net" is also delaying the release of Bannerlord couse that mouse problem (But I might be wrong, and there is another reason for the delay). However, I think cloud gaming is getting more and more people involved to play and use it instead of the home PC. So I think it's pretty important to resolve thins issue. I hope my information would help you to fix it as soon as possible. And also it should help to everyone, who is struggling from that issue on cloud platforms. BTW, does anybody don't have such problems by using the cloud gaming?
The game is awesome and I hope I will enjoy it fully after the mouse issue will be fixed.
Thank you!