Thank you for your answer. After verification, we had some of our packs that were outdated. We don't really know when a pack is updated so it's hard to keep track of what is and isn't up to date.
Nevertheless, with the latest packs, here are a bunch of issues we decided to take note of, for you to fix in further versions :
Packs checked : Hairpack, Celts&Vikings, Paladin
-UM_Beard_D slot is Hair instead of Beard
-UM_HairStyle_A_FEMALE_Recipe has HumanMale as a race
-HairStyle_C_MaleVersion doesn't fit the HumanMale head, and has hairs clipping through the head (See picture)
-UM_Beard_A and UM_Beard_B slot is set to Underwear
-UM_Moustache_A and B slot is set to Complexion, while UM_Moustache_C is set to Beard, UM_Moustache_E is set to Tattoo
-Moustache_DBeard_D_Recipe slot is set to Ears
-UM_HairStyle_G slot is set to Face
-All CV_Tabards have clipping issues near she shoulders on base HumanMale race (See picture)
-PAL_Boots Overlay has no overlay name and as such is not getting indexed, breaking the PAL_Boots Wardrobe Recipe
-All Moustache looks wierd and uneven. Might be due in part to URP and not being able to find the right settings, but so far all Moustaches are not symmetric and the tips (left and right) looks way different (See pictures)
I will let you know if we find anything else as we go through all recipes again.