Visual flickering when a solid block is placed overlapping/inside a sign

Description:

There is a visual glitch (z-fighting/flickering) when a block is placed in the same space or directly adjacent to a sign, causing parts of the sign texture to flicker rapidly.

Steps to Reproduce:

1. Place a sign on the ground or on a wall.

2. Place a solid block (e.g., Stone) so that it intersects or is directly flush with the sign's model.

3. Move the camera/player around the sign.

Observed Results:

Parts of the sign texture flicker or flash rapidly through the block.

Expected Results:

The sign should either be hidden properly, drop as an item, or render without visual flickering (z-fighting).