Item quality change for buildings when using blueprint from normal to rare.

Example: I make some ghost copies of a rare quality electric furnace and the drone grabs a normal quality furnace from my inventory and pastes a rare quality furnace instead. The normal quality furnace is now a rare quality one. It's quite convenient to convert to higher quality but seems like quite the cheat.

Yes this is indeed a bug :) How would you say the intended behavior should be? Lets say you have no rare quality in your inventory, should the drone build the normal furnace as a replacement, or should it do nothing at all?

Maybe do nothing at all until the right rarity is available. Right now it converts the basic rarity item to the ghost rarity item placed.

I was able to easily reproduce this but unfortunately it seems like it might need a bug fix from the devs to properly handle this: https://forums.factorio.com/viewtopic.php?f=25&t=120825

Thanks for the effort. I'll just toggle the bots off when I'm putting down quality for now so I don't cheese. Just gotta remember to do it when I need to.