Bugged Crash Interaction with Mimic Stash MTX and Gruthkul's Pelt

Hello i recently discovered bug with the mimic stash pet transformation and Gruthkul's Pelt Wyrmiscale Doublet (which prevent anyone to use any "spell" including transformation) but if you transform yourself before wearing the Gruthkul's you still get it function of character size and the Crashing Bug, I tested it on multiple people including EU and NA servers its the same situation, the biggest problem is it prevent anyone from trading including faustus via crash and going back to hideout after mapping/rejoining hideout. Its not working when other player is in hideout but only works when someone trying to rejoin hideout when there is transformed player into mimic with Gruthkul's Pelt.

Here is video showcasing the problem with one of my friends who can't get into his hideout cuz of crash, and also screenshot with the crash information.

https://www.youtube.com/watch?v=PmdLk04lgvg