The Smart Ass enchantment causes a stack overflow error when a 3x3 pickaxe/hammer/digging tools are enchanted with them. This occurs when sand/gravel is dug. The server freezes for 60 seconds before shutting down from stack overflow and ticks taking 60+ seconds. Crash report attached.

While the log does not specify the enchantment, testing indicated that it is the particular problem.
MC 1.12.2, Forge 14.23.5.2768, Unique Enchantments 2.0.1 (version says 1.9.0 but file says 2.0.1?)
crash-2021-10-20_18.50.30-server.txt

Hey there,
thanks for the report.
Looking at it, we have a vague Idea on what's happening
but to be frank, as of right now there is nothing much we can do about.

Even more we should mention that as of right now we do not really support multi-mining(idk how it's handled with vein-mining).
At least for right now, and there are no plans on doing so.

We'll see what we can do, but we can't promise anything.
For time being do not use that Enchantment with AoE Mining.

Technically not a bug because the Mod throws a Event that should not be thrown and does not even check if it is selfcalling.