When disabled (because of Thaumic Tinkerer's version) the Flugel Tiara variant still requires Botania's Smokey Quartz, and will not accept alternates.

It because we declare the recipe for the variants in a loop instead of one at a time.

Due to the quartz types being added by us, I would guess it was never expected to need to oredict the recipe for them.

https://github.com/Vazkii/Botania/blob/master/src/main/java/vazkii/botania/common/crafting/ModCraftingRecipes.java#L1410

Well, the config option specifically says it's for those using Thaumic Tinkerer, so I assumed it would work with that. The Tiara was probably added much later, though.

yep it was, I'll take a look when I get home tonight