Reproduction steps:
1. Go to world border or move world border to you.
2. Have auto jump on.
3. Walk into the border.
Result: Jumping. Repeated jumping.
Linked issues
is duplicated by 1
Comments 7
Probably it sees that you can't walk forward, but also that one block higher in front of you is no block.
Relates to MC-102099
Maybe.
While walking backwards, auto jump only triggers when looking up or down at an angle of at least 78°.
Confirmed.