Haven't noticed this before the newest snapshot (20w15a) so I think it might be a new bug. I did search for existing tickets but found nothing quite matching this.
What happens is that I start to crawl when walking past blocks, specifically warped wart blocks in the nether (see attached video). Maybe it's only happened to me with that block type because they're so ubiquitous in the areas that I'm traversing frequently, and they're often floating in the air due to generation and/or enderman griefing.
Also, I can't say this definitively, but it seems to happen near the corners of blocks only, i.e. when I'm walking around a corner with a warped wart block on the inside at eye height, and an air block below that (at foot height).
It's happened to me about 5 times already today but I cannot reproduce it intentionally as much as I've tried.
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Chandler
I have noticed this to, but have only been able to replicate it with soul speed.
Chandler
O_and_W_W
From my testing any full block in front of you can cause this. It's hard to recreate but sprinting into a block and then quickly crouching works well enghouh for me.
Chandler
This probably duplicates MC-177970
migrated
I had this bug this too.
Chandler
Duplicate of MC-177970
migrated
So annoying happens so frequently.
Chandler
Duplicate of MC-177970
violine1101
Please stop commenting here. This issue is being tracked in MC-177970 now.
Sonicwave
@unknown: Please don't post the same comment multiple times in a single report. If something got missed, feel free to let us know at the Mojira subreddit or the Discord server (which has a separate channel for requests for mods/helpers).
Chandler
I'm sorry, I will use those platforms in the future.