Don't have an enormous amount of playtime yet, but I recently acquired Climate Engineering in a Riftborn game and started terraforming my planets to sterile, only to find that despite the system construction tooltip showing the full list of qualities for this planet type (i.e. Medium, Barren, Cold, Sterile), the terraformed planet loses its temperature quality, resulting in, for example, a Barren or Arctic planet which is not cold and does not have improvement bonuses associated with cold planets (i.e. Exoscience Stations provides +1 science per pop as opposed to +2). It does, however, remain Sterile. As of right now, I am unable to personally confirm whether this issue occurs when other races terraform to Sterile planets or just for the Riftborn, nor can I say I have noticed whether or not this bug occurs while terraforming from one non-fertile/sterile planet with a specific temperature to another. I have a save available with a Barren terraformation one turn from completion if you need to see the bug in action.

I can confirm that this happens for other races, temperature qualities are not properly preserved via terraforming.

Hey guys!

We're aware of this issue and we're working on it, I believe it's actually fixed on ou internal version of the game so I'd expect the fix being pushed sooner than later :)

Thank you for the report, though