When walking / running in Minecraft and moving the mouse a little, the cursor at some point does some oversteering where the character is suddenly looking in a whole different direction than the mouse movement would suggest it.

Steps to reproduce:

Standard keyboard-configuration, standard mouse configuration

Walk / run in Minecraft and move the cursor from 45° left to 45°  right of the normal FOV

It seems like Minecraft re-sets the mouse position at some point. An output of the coordinates of the mouse cursor confirms this.

This bug only happens in 1.14 Minecraft.