When Carpenter's Wedge Slope blocks have the texture of some Chisel Laboratory blocks it doesn't drop the right block. Depending on which version of the Laboratory Block, it drops a different block. The block dropped doesn't have a proper name or texture, it's called tile.carpentersSlope.name. Depending on the laboratory block used it has a different metadata value.

Using Carpenter's Blocks 3.3.1 and Chisel 2.0.0.3.

Interesting. I'll look into it.