If you build a "L" out of blocks that is facing east or south, the autojump triggers if you walk against the wall.
If the facing of the "L" is west or north, the autojump does not work at all.
Video:
MC-133272
Autojump is not working properly for certain block shapes in different directions
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LiquidDev
(Unassigned)
Community Consensus
Player
auto-jump
Minecraft 1.13-pre7, Minecraft 1.13-pre9, Minecraft 1.13-pre10, Minecraft 1.13, Minecraft 18w31a, ..., 19w34a, 1.15.2, 20w16a, 1.16.2, 1.21
Retrieved
Still in 1.13 pre9