Whenever any 2 keys are pressed at the same time only 1 of those keys tends to get registered as an input. This bug is most noticeable when sprinting as I use the 'ctrl' key to sprint while pressing 'w'. I've also noticed this bug when I try strafing as I often hit 'w' and 'd' or 'w' and 'a' at the same time. I've tried pressing 2 keys at the same time in Minecraft 1.12.2 and this bug doesn't seem to occur.