`java.lang.UnsupportedOperationException: Should not be called`

[louwers]

Full log: https://gist.githubusercontent.com/louwers/267c8a9e12cb1a0d0c2c2bccaa42b612/raw/1984ad3a0d1a4450c370c3d19cace697fcc12163/log

[fwcd]

I'll mark this as a dupe of #600 for now, please reopen (ideally with a source file that reproduces it) if that doesn't cover all cases