Here you have a video in that you can see this better:
How to reproduce:
Place a block (for example stone)
Start to walk
Get the closest you can to the stone block
Try to jump - you won't
Linked issues
Comments 3
Can confirm.
It only occurs while you're still moving/trying to move forward. (Or whatever direction you're moving in.) If you release the key, you're able to jump again.
Duplicate of MC-142913, sorry
You can fly by this method like this:
https://youtu.be/RMQ9yPjLGBo