Hello there Crafters!
Thanks very much for your reports! I have an update with regards to these bugs and would also like your help confirming the behavior of one of them on your end:
First, Arkanian and Underworld Relics should not be Bind on Pickup. This is definitely a bug, and we've fixed them to be Bind on Equip for Game Update 2.2.1.
Secondly, for the issue where Reverse Engineering Underworld Relics gives an error message and does not provide materials upon a successful attempt, we are finding in internal testing that the appropriate schematic is still learned. If you're a player that has experienced this bug, will you please post to tell us whether or not you're learning the schematic?
We appreciate any assistance you can provide with the question above.
I've had this RE error issue with Dread Guard relics and have not learned the schematics. I assume it would be the same. I have seen some people encounter the issue and still learn the DG schem though.