I'm playing on a Samsung Galaxy tab A 2017 model. In minecraft pocket edition 6.1.0.1 breathers are lots of missing textures. One example would be the player model Steve. The only part of Steve that shows up is his head and the rest of his body is missing; his arms aren't visible in first person too. Missing mob textures:
Sea turtle, cow, pig, sheep, chicken, ocelot, zombie, husk, stray, skeleton, creeper, Vindicator, vex, villager, zombie pigman, wither skeleton, polar bear, spider, cave spider, squid, silverfish, endermite, witch, blaze, rabbit, phantom, enderman, and wolf have missing bodies or body parts; legs, nose, etc., and have floating weapons if they have any

Slime and magma cube are missing faces and magma cube is missing part of it's body

Evoker is missing it's entire body and is invisible
The fish and aquatic creatures were hard to see what they were missing.