The bug
If the player is standing in a 1.5 blocks tall space while sneaking, it is able to release the sneak button to stop sneaking. Then, it can move at normal speed and even sprint. The player's hitbox doesn't change, while the player model does.
Screenshots
[media][media][media]Linked issues
is duplicated by 4
relates to 1
Attachments
Comments 4
I know that the page says "resolved" now, and that it was technically fixed in the latest snapshot, but you can still move normally and sprint while crouched like this. So basically, the only thing resolved is the visual side of it.
Created MC-147270 for still being able to walk at normal speed and to sprint.
migrated
Confirmed. Not only does the player model change, but the player is able to walk in normal speed, and even sprint. I changed your report to reflect that, I hope you're fine with that.