https://gist.github.com/ProsperCraft/5ffd2ccc3e9ea591abd34b3cc4f2c969

ConfigurableCane-1.14.4-1.5

I don't know if you found the culprit yet, but someone provided a full log in the other mod's report, and it shed some light in the situation, see my reply there: gigaherz/ToolBelt#38 (comment)

Seems to be the same crash as #1
As I told them, I have no reason to believe it's my mod's fault. Unless you have a full log that shows some other exception earlier on, the only thing that stands out in the log is that randompatches is patching some vanilla code...

Hmm, can't replicate with only Configurable cane, so a bogus crash log.

Can't replicate with configurable cane, and random patches.

I will add the mods one at a time until it happens again. and then report to them.

I see, so both are collateral damage. I wonder if it's just a race condition that starts to show up with bigger packs....
One possibility that seems increasingly more probably, after both these reports and gigaherz/ToolBelt#38
Is that some parallel event isn't properly waiting for the entire pool to join back into the main thread.