Ah, this is a message for trying to pick up the items in crafting.
True indeed, its mistakenly (been) in singular form for not only shingles but for any pausable crafts.
Fixed now with the plural form... and maybe it would be better to say finished than ready. ie.
The [items] here aren't finished yet.When actually looking at the items in crafting
Fixed - persists in 3.85beta.