The method BundledCommons.mostSignificantBit can get stuck in an infinite loop, specifically in line 112, as found using VisualVM (trace here). If I'm not mistaken, the issue is the use of >>= instead of >>>=, because -1 >> 1 == -1, hence it'll never reach zero.

This method is meant to be used for bundled signals. You can't have a -1 signal, hence the method shouldn't ever be called with a -1 signal. Is that not so?

I've seen a server freeze at this very point (with the trace linked above). Could reproduce reliably when entering the world. I had been sent the world where this happens by someone else, to investigate whether it may be caused by my mod, but I still have it lying around, if you're interested in it?

No, its okay. I added in a simple sanity check in the method. Fixed via 2efa2bb