Additional lines appear on the crafter's face when it crafts

Steps to Reproduce:

1. Enable the Update 1.21 Experiment;
2. Place a crafter with a recipe inside;
3. Activate it and observe its front side.

Observed Results:
The "mouth" opens and some additional lines appear on its "cheeks", more noticeable on the right side.

Expected Results:
Only the "mouth" changes.

Screenshots/Videos attached: Yes

Notes: This is referring to the front texture exclusively.