Z-fighting and slight model issues with nautiluses and zombie nautiluses when looking at them with a spyglass from a distance

The bug:

Z-Fighting appears on Nautilus and variants of it near their mouths.

Z-Fighting also occurs on an area of the “coral” on the warm model, and more areas on both variants, with a custom texture that fills in all usually transparent pixels.

A piece of geometry on the coral variant is slightly misaligned, creating a gap/line in the texture. (geometry issue images in the comments)

A more noticeable effect due to the custom texture with higher contrast between the 2 z-fighting planes.

Z-Fighting revealed by a texture utilising usually transparent pixels.

Steps to reproduce:

Spawn a zombie nautilus or nautilus, move a few blocks back and zoom in with a spyglass whilst the mouth texture is diagonal to the body.

For the secondary z-fighting issue: create a custom texture for the nautilus warm variant with a contrasting texture and follow the steps above.

For the geometry issue, repeat the steps above and focus on the highlighted area.

Expected result:

No z-fighting occurring and corrected model.

Actual Result:

Z-fighting and model glitches.