The enchantment table does not recognize items that do not have built-in enchantments. If you add a custom enchantment that supports custom items, such as a potato, the enchantment table will not work with the potato, even if the custom enchantment works on, say, a chestplate.
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@apple502j I am not defining a #non_treasure tag, but I did add it to the #in_enchanting_table tag. And I can make the enchant show up in the enchanting table for books, armor etc. just not for otherwise unenchantable items
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Can replicate. This happens with any custom item regardless if you add it to the Primary Items subset, or if there are regular weapons/tools covered by the enchantment set, etc etc. I cannot find a case where it works properly for custom items.