When I am walking or any type of form of speed, the game glitches as I look down and up again. This may be a glitch or not, I have tried to same thing with the rest of the other versions such as 1.14 and so on and so forth. The only version that I am currently having trouble with is 1.14.1.
I was interested in what this bug report was talking about but have been unable to replicate it so far. It may be a problem with your mouse, or I'm mis-reading it. I'm wondering but are you using a regular mouse or a track pad? Is it localized within a single world or does it effect all your worlds, does it effect servers/realms? Was there any potion effects or just regular game play?