Witchery Resurrected has many of the same features of Witchery, including potions and transformations that can change your size.
With Aqua Acrobatics installed, the eye height remains constant regardless of transformations or potion effects.
You can also crawl in these new forms, despite it visually not matching up at all.

Thanks for the report. Unfortunately, as the mod appears to be closed-source and not officially released, I am not able to provide reliable compatibility for it at this time.

Aww. That's fair, though.
Hopefully the next version will be an official release, given the plan is for that version to be the start of Beta.

They do have a decent API even now, with some other mods having support for its transformations. They seem very willing to answer questions in their Discord server, if you were interested in getting a head-start?

Compatibility will be available in 1.13.0. Thanks again to @Shazuli for this contribution.