In short: the game at some point (in principle, recently, a week or two ago) began to swear at Unity (Unity 2019.3.15f1_59ff3e03856d). The game did not crash immediately, but during any battles, be it modifications or original battles. I tried different ways to solve the problem, and in general I was looking for the essence. One way is to reinstall the game. Reinstalled. Reloaded the modifications.... Now the game gives new errors.

Screenshots of the game log are also in the profile