I'm not sure on the specifics, but I have a reproducible error that puts players into a fatal error loop after targeting the interface black on a 9x9 chest. It affects players immediately after login as their character will still be facing the block upon login. FTB Sky Factory 3 ver. 3.0.6. I'm happy to provide a world save or do testing if needed.

Duplicate of #65, not caused by Colossal Chests.