For any bug reports please provide the following details as well,

• MC Version: 1.16.5 - forge 36.2.8
• C&B Version: 1.0.43
• Do You have Optifine: No
• No other mods installed

Other info:

Issue

Gif of the issue:
https://s1.sunekaer.com/i/04-11-2021_09-55-28_%25pn.gif

You will need to expand what you think is wrong here?

Sure,
Removed bits from a block shouldn't be pitch dark.
also if you see the gif the first time I use the chisel on a block the whole block becomes black for split-second

Enable the Forge Experimental Rendering Pipeline.