Everything is updated and I even removed all other mods except optifine with forge of course. Still causes it to do the same thing where the block texture goes missing and the whole block turns purpel and black squares of course. Can't use C&B at the moment for this patch and version.

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

• MC Version: 1.16.1
• C&B Version: 0.0.6 beta
• Do You have Optifine: yes

Fixed in the upcoming 1.0.11 or 1.1.5 releases

I can try to fix this but yeah this is a low priority at the moment.

I had the same problem, removing Optifine from the mods folder fixed it.