A graphical issue occurs whenever a block is chiseled, but only when a Forge port of Sodium is used.
Port used in testing include Halogen (v2.9.10).

Examples:

No Sodium Port

Halogen mod installed

Instance with Chlorine (v0.0.1.3) can be found here

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

• MC Version: 1.16.5 (Forge 36.2.2)
• C&B Version: 0.3.4
• Do You have Optifine: No

This is related to sodium.
Please report the issue to them.