Decided to put Beta 5 through its paces a bit today with the release of the opt-in patch. Ran into something a little humorous that almost certainly is a bug:
Not only are there a pair of Thulium planets in an asteroid field, one of them is on a Durantium deposit! For the record, the game is reporting that tile as Thulium and not Durantium.
Little afraid to see what happens when I eventually mine it. 
I'll be sending in a ticket (with save file and screenshots) in a few minutes. 
EDITED: Ticket created: #XAZ-738-45051