I'm experiencing an issue with the newest version of Krita (5.2.5) on my Galaxy tab s8. Namely the app crashes on start-up, I have not experienced an issue with krita before the newest update. I have already tried clearing the cache, reinstalling the app and even updating android.
You can try to exit the beta program and install the stable release 5.2.3. The fixed version in beta is coming. Don't forget to keep your application data. Here is the discussion: https://krita-artists.org/t/solved-cant-launch-app-on-android/105260/119