I must say right away that I use RimPY Mod Manager. I'm playing on version 1.4 and I have frozen pawns as well as animals. I spent a long time figuring out the place of the "Rim of Madness - Vampire" mod (I'll shorten it to RMV) in the list of mods, but it didn't lead to anything. However, when I removed all the mods and left only RMV, it worked. I figured it out for a long time and found out that my pawns were not moving because of the work of the "World Edit 2.0" mod (I'll shorten it to WE2.0). I do not know why the system does not see that they are in conflict. I'm not even sure if they conflict, but if you look in the game logs, there is an error with WE2.0, and after that an error with RMV, also when I removed WE2.0, RMV worked and the errors in the logs were removed. Maybe I have such a problem, but if you have the "World Edit 2.0" mod, then try to remove it and start. At least it helped me.
If you need it or are just interested, I can also send you my mod sheet, that is, the mods that I use