If you get a sword of any type, and start running, you will run normaly, right? So, when you are running with the sword, start holding the left button of the mouse, looking to the ground. You should start glitching.
This may happens in 20w09a too.
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violine1101
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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