Put the summary of the bug you're having here
When you click and hold on a sign, the little cracks animation is shown on a full transparent block rather than just the sign
What I expected to happen was...:
I expected the growing cracks to just appear on the sign itself.

What actually happened was...:
The cracks showed up as if they were on a full block, giving the impression of a transparent block.

Steps to Reproduce:
1. Place a sign
2. Click and hold to remove it and the animation will be wrong