Crash report
Happens at random (mostly when I port from the Nether to the Overworld where the Dark Oak drawer in question is positioned). When I restart the instance everything works fine, after say an hour - the same crash. The drawer contains some Reliquary items (The mob hearts, they have an animations (possible cause?)).
Forge: 1794
Chameleon: 1.1.0
Storage Drawers: 2.6.0

See if version 2.6.1 helps. Rendering should be protected from sharing render state across threads, if that's what was really happening.

If it's still occurring, re-open the issue and see if you can find a fast, reliable way to reproduce the crash. Was the dimension travel a guaranteed way to cause it?

Looks like I'm probably trashing my own render state against the new multi-threaded rendering. I have a general idea to fix this, but won't be able to test it.