@Kamekazi_raleway, it only deletes worlds if you clear the data in addition to the cache.
Pixel 6, android 14. Happy to assist debugging/provide any crash logs.
Clearing cache let's me launch the game, otherwise it crashes during the mojang logo.
I can confirm this as an issue on Android with realms.
As a former software dev, happy to debug/test any fixes. This bug is occurring on multiple android devices I own.
@v-magwar I've identified another core aspect here. I encounter this primarily when playing on a realm. If I "Save and Quit", then wait for everything to finish up before exiting, the game relaunches fine. I'm only encountering this issue if I swipe off Minecraft or turn off the screen while still logged in to the Realm.