My log fills with duplicates of UnsupportedOperationException attempting to use getTileEntity on paintable blocks.
A snippet (This also occurs on Rendering Thread 1 as well): https://pastebin.com/2icYbzy4

No crash, but these painted blocks do not show up at all when viewing in FarPlane chunks, probably because they can't obtain any block surface to show. Also not the end of the world, but originally I was going to report because I thought it was not happening previously on an earlier build. I double checked and it was, so more than likely it's a kink that still hasn't been supported yet.

should be fixed in c6d3d8f.