Situation was as followed:

In Realm.

In Boat.

Full Inventory.

Armor Full equiped.

Treasure Map in hand.

playing on my huawei p30 pro connected to usb mouse and keyboard.

Now after i found the treasure i wanted to switch back to my map in the inventory which was selected and thus shown in my other hand (treasure map left hand and map map in right hand) and i dragged the treasure map from hand outside the window to through away.

sorry i cant remember exactly if i then switched the other map to that second hand or if the game already crashed.

well after that, every time i started Minecraft it crashed after a short while playing in that realm.

it felt like it also crashed when just in the menu.

only after i erased all data on the game (cache was not enought) the game loaded normaly and i was able to continue playing.