When re-entering a world created in the current snapshot, re-entering it shows a warning. When clicking "I know what I'm doing", the game might crash.
MC-187397
All worlds are corrupted; reloading a world created in the latest snapshot shows a warning and may crash the game
Resolved
Duplicate
0
If the crash is "Lock is no longer valid", it's MC-187353, if it's something with POI, MC-187350. The warning is MC-187352.