The player automatically jumps when pressing against a block while in water
Open
51
I was playing around with my water bucket then my teacher called me away and when I came back I was jumping on the stair next to water without pressing space (jump).
To reproduce make water flow next to the stairs and stand halfway in between the FLOWING water and bottom step of stairs.
It can also happen with still water if a move button is held. It also affects non-player entities that extend EntityLivingBase, most notably armor stands.
It also happens when walking into flowing water against a solid block (you'll end up on top of the stone bricks):
There is another bug right now (MC-142913) that prevents jumping altogether when you're standing next to a block, which affects testing this bug. However in this bug, the "jump" in water still occurs ONCE each time you press forward (while also standing on a stair block as in the description).
MC-181407
Automatic jumping when walking into a fence gate on soul sand next to lava
Resolved
Confirmed with a similar set up involving the block above a fence. I will post a screenshot soon.