When Crawl is installed, the sneak animation seemingly reverts to its 1.13 (taller) form for every part of the body except the legs. I noticed this because Elytra still animate according to the 1.14+ animation.

Here's a screenshot of that animation in vanilla
...and with an elytra

And here's a screenshot of that animation with Crawl and Fabric API (and only those two) installed
and again, with an elytra for emphasis

Thanks for report! I' ll recheck that tomorrow

Please, try out this version

https://www.curseforge.com/minecraft/mc-mods/crawl/files/3071106