The corners of a shulkers upper shell has a black texture instead of purple

What I expected to happen was:
The corners of a shulker's upper shell has a purple texture

What actually happened was:
The corners of a shulker's upper shell has a black texture

Steps to Reproduce:
1. Find/Spawn in a shulker
2. Look at the corner textures of their upper shell

Device NVIDIA Shield Tablet K1

Testing Conditions: Using the default texture pack