If you are standing next to a wall where the bottom block is missing, if you go against the block, it will randomly put you into crawling mode. I discovered this while strip mining. Attaching video where I got it to happen once, I had to try and get it to work. Sometimes it will just happen for no reason without the crazy mouse movement. https://www.youtube.com/watch?v=1K5mGoYu6aY
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galaxy_2alex
Thank you for your report!
However, we are already tracking this issue, and this report is a Duplicate of MC-177970.
Please use the search function in the future to prevent duplicate reports.
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I've experienced the exact same bug. It's present in 20w18a as well.