By combat im assuming you mean rolling dice? Im not the creator nor an expert but you could possibly try since its only when you start combat, getting a save file in 0.21.9, then closing and reopening the game. Or, you could if your techsavy enough extract the save and store it on your pc(you could probably do it on mobile, like i said im no expert) and delete the game itself and re-download it as it's possible some files are corrupted.
Worst case scenario, you have to completely restart yoyr CK journey. Best of luck to ya nonetheless