Compat issue with ULTRACRAFT sliding

(please note that this is a semi-copy-paste from the git from the ultracraft one for issue ultracraft#181 and that i was using Sinytra Connector )

How did i find this bug?

so i was playing around with the ULTRACRAFT mod this mod when i discovered that (with ANY latex tf, yes even the human latex) if you are one of the latexes w/ consciousness, for some reason, the slide will NOT change your height to 1 block.

Also note that the feet paws and some limbs will still do the basic ground movement animation

sliding while tf'd vid: https://drive.google.com/file/d/1DqTbb9lpAuoAECwNfA1chSJpRW76f9hB/view?usp=sharing

sliding while not tf'd: https://drive.google.com/file/d/1zCa7cSnUDemRuE8XhglPVT14AoRYCOp8/view?usp=sharing

Again, i will say, if you can give me some tips for debugging this slide height change thing and the animations for it, its appreciated.

(also forgot to put this here, when u get tf'd also doesnt matter if its human latex, the player will not hold the guns with the arm outstreched.
also the nailgun is weirdly posisitoned when holding it. vid here: https://drive.google.com/file/d/1DBdP9PDaBivg2j4LqDRB-JaK6om47CEO/view?usp=sharing )

Start by reproducing the ULTRACRAFT transformation and slide behavior with Sinytra Connector, comparing transformed and untransformed movement against the linked videos. Investigate why transformed players do not reach one-block slide height and why arm poses and nailgun positioning differ. Done means the slide height, movement animation, gun arm pose, and nailgun position are correct while transformed.