Game crashes when completing a block (when it converts from a chiseled block back to a normal vanilla full block). Tested with stripped birch log.
crash-2021-01-13_21.50.51-client.txt

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

• MC Version: 1.16.3
• C&B Version: 0.2.9 (seems to work in 0.2.8 & 0.2.7)
• Do You have Optifine: tested with and without