When building a tablet-based mana storage system, I found that my filtered item collector does not pick up emptied tablets, while it did work with crafted ones.
Turns out that a new mana tablet lacks the mana NBT value altogether, which means that new tablets cannot be added to the system via autocrafting, at least without "rinsing" them in Mana first.

Running Botania r1.10-363.

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