Hello,
First of all, thanks for this games, i've been playing non stop for the past 35 Hours, and right now i'm on my journey of center of the core.
I've read instruction on wiki and official topic in here, but there is a big big error! I've gone to research lab ( Xanion Zone ) and i've done what you asked, 3 Legendary ( 2 Mining upgrade ) + Artifact V3 ( The sold by vendor for 3Million. ) and i've got a fucking stupid legendary titanium mining turret !!!!!
So now what, can dev tell me please, please, please, before i waste my times, is the game created to handle that kind of bug? And i will be able to get it back for 3 Million, ( sellable again ) or its fucked up and its gone in scratch so i need a new games..