Baritone falls into lava in Open Nether

If you walk through open nether for long enough, the server will load new chunks which have lava flowing from the ceiling, which starts slowly flowing down. Baritone does not recognize this and walks into the flowing lava.

Reproduce the issue by walking through Open Nether long enough for newly loaded ceiling lava to flow downward. Start by tracing the pathfinding and hazard checks used when Baritone encounters newly loaded chunks. Done means Baritone detects flowing lava and avoids routes that lead into it, with behavior verified in the reported scenario.

Written by the indexing model from the issue text.