Bottom face of Warden's right arm is missing in 'warden_bioluminescent_layer' texture

Related to MC-249397

The Warden has a 'warden_bioluminescent_layer' texture to make certain parts of it glow in the dark. The bottom face of the Warden's right arm is not filled in, whereas the left arm is.

This can be noticed in-game by comparing the bottom faces of both of the Warden's arms.

How to Reproduce
1. Make a layer of barrier blocks.
2. Spawn a Warden above it.
3. Go below the Warden

Observed Result
One side of the Warden's arm is not "glowing".

Expected Result
Both sides of the Warden's arm should "glow".