How to reproduce:
be in creative mode
Find or build a wall
pick a sword or a trident
Walk left, right, away and towards the wall always looking at it, all of this while holding left click (or keep pressing it really fast) with the weapon like you would do when breaking a block in survival mode
you can see that in all directions there is a constant jitter in your movement
Thank you for your report!
We're actually already tracking this issue in MC-157436, so I resolved and linked this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature in the future to see if the issue has already been reported.
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