TNT Flashing Graphic when lit looks cut up and faded. / Z-fighting

When TNT is lit, the white flashing graphics are buggy, and appear to have "cuts" and fades in it as if it was a mesh overtop of the TNT.

What I expected to happen was...:
I expected it to be full white and covering the TNT as it used to.

What actually happened was...:
It was white but I could see black lines and part of the TNT texture through the white.

Steps to Reproduce:
1. Place TNT
2. Light TNT
3. Observe Flash

Additional Notes
If I remember correctly this isn't a new bug, it's been happening since 1.2.3/4/5 or possibly earlier.