Server crashes at random about once or twice a day. Always when at least one user is online, thus far it has not been the same user, or with users in the same general area.

Expected Behavior

Not crash?

Current Behavior

Crashes!

Possible Solution

Not crashing!

Steps to Reproduce

Happens randomly since upgrading to 1.6.0, can't yet discern a pattern. Will continue to monitor and update if I notice anything.

Log

Crashlog here: https://gist.github.com/malcom2073/42b652187c490ed1342cc9b40fcda29e

I can provide more crashlogs, but they are nearly identical to each other. Always IllegalArgumentException about not being able to get PropertyEnum of a BlockPlank from an air block.

Detailed Description

Bump, this is still an issue on our server, pack version 2.0.0.

I couldn't figure out, what triggers this crash. At worst, it might be random chunkloading or a race condition. This crash happened more often when the server was new and more exploration was done, which suggests that it is related to workgen, however this could also just be a coincidence.

Crashlog is nearly identical to the OPs one, see here: https://pastebin.com/2akmrcFc
Noticeably the "Affected Level" section of the crash report is completely broken and contains next to no information in both crash reports.