Chisel - MC1.12-0.1.1.26
Optifine 1.12.2 HD U C7
CTM - MC1.12-0.2.3.9

I know modders don't like to support optifine but this bug wasn't happening before. So I just wanted to let you know

Removing optifine fixes most of the textures except this one:

Please report this to Optifine, as this is very likely on their end.