I had the nerve to craft myself a blue hammer when I got the recipe and wanted to recraft it to t5 weeks ago now. I already reported the bug back then but seeing how Blizzard has so far still failed to enact any fixes, I might as well turn it into a forum post.
Now unfortunately I have not been ranting enough on the forums yet, so my “trust level” is not high enough to show you screenshots of the problem.
You’re just gonna have to believe me that with the same mats and optional reagents I’m somehow losing 122 skill on the way from a normal craft to a recraft, Meaning if I want a t5 hammer, I’d have to craft an entirely new one and waste the 300 acuity I already spent on the old one.