[MC-94805] Difficulty doesn't lock in singleplayer

Locking difficulty doesn't work in singleplayer.

Create a new singleplayer world
Change the difficulty to "Hard"
Click the lock and lock difficulty
Save & quit the world and re-enter
→ ❌ The difficulty was reverted to normal and unlocked

Linked issues

Can confirm.

Confirmed for 15w51b

Confirmed for 1.10-pre1

Is this still an issue in the latest snapshot 16w44a? If so please update the affected versions.

This is an automated comment on any open or reopened issue with out-of-date affected versions.

Can confirm for MC 1.12.1.

wobst.michael 2019-09-15T10:12:40Z

Fixed in 19w11a along with MC-44471.