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Currently there is not, but people seem to keep asking for it so I might make a way to in the next main release.
That's interesting. I can't tell why it's doing that from what you've said, and I don't have the time to look further into it myself.
When is that piece of code getting called? Is it in onEnable? Is it in a command? Can I have the full code of how that's getting set? Sometimes...
What does your code look like?
Try setting "enchanting_table.enchanting_type" to vanilla_30 or another accepted value, then restart the server.
I can take a look into this.
Set them to treasure enchantments. They'll then only show up where treasure enchantments are possible.
What is your...
If that doesn't work, make sure that your plugin is enabling after Enchantment Solution.