Shulker box block top texture is flipped 180 degrees / incorrectly mirrored

The top texture of a shulker box block is rotated 180 degrees, leading to undesired and unintended results when making a resource pack.

Steps to Reproduce:

1. Install and use the attached resource pack
   shulker_top_texture_bug.zip
2. Place down a shulker box
3. Spawn a shulker entity next to or near it

Expected & Observed Results:

- The shulker box block's top texture will be rotated 180 degrees.
- Both the shulker box block and shulker entity top textures would have the same rotation.

Screenshots/Videos:

Notes:

Related to other flipped/rotated UV map issues:
MC-138280 MC-166026 MC-267863 MC-267457 MC-256048 MC-250692 MC-241036 MC-241006 MC-225796 MC-222943 MC-221851 MC-214700 MC-203036 MC-202598

Original Description:

The bug

While creating a texture pack i noticed that the top textures of shulkers (their shell, not the face inside) are rotated 180 degrees, and since it seems like shulkers themselves never rotate it has to be a problem with the texture 'n'