Recombinator output item tier bug(?)

Hello there everyone, good day/afternoon/evening to you and thank you in advance for your time. I'm here with Bug Report ID: #3673378279, though I'm not sure if there were additional instructions I was supposed to follow when using the ingame /bug command, to report an unexpected outcome when recombining.

I turned on an omen of recombination, took two solar amulets, both magic (blue) rarity, put them in the recombinator, and selected one's prefix and the other's suffix. Ahead of time, I'd switched stash tabs to the one with my expedition currency in it so the game would automatically grab from that instead of me needing to guess how many I'd need to grab. Then I hit recombine, and it succeeded, but it created a rare (yellow) amulet with one prefix and one suffix!

I'm pretty new to recombining, but I can't think of any reason that should have happened, and when I asked other people about it, they said their experience if they did a similar thing was two different affix types from two blue items making a blue item. Now, I don't know if those comments were true, or mistaken, or if people were pulling my leg! But I can't find official information one way or the other inside or outside the game itself.

The ingame tooltip for the recombinator doesn't specify what should happen to the rarity of the item, so if this is intended behavior, it would make sense to me if at least the tooltip were changed to mention this. And uh, if it's not intended behavior, fixing that seems important, heh.