Not sure if this is related to the other 2 issues.
I think it might be an indium incompatibility.
https://paste.ee/p/SCU9R

Yes, pretty sure this is the same bug as #10 but the crash is in a different, easier to understand place.
Please give this version a try and report back on whether it fixes the issue for you (assuming you can somewhat reliably reproduce it, cause I've never ran into it myself): https://i.johni0702.de/bobby-1.1.0-SNAPSHOT.issue.14.jar

Edit: That version still has some WIP stuff in it which I'm working on atm, so don't be alarmed if the lighting is broken.
Edit 2: Same fix is present in Bobby 1.1.0 but without the lighting issues.

Duplicate of #10