This is not really a bug, just a mechanic in the game so poorly thought through that it feels like a bug…
I was crafting on a 2-handed axe used by my Forge-Guard, level 69. It was the situation where I was able to upgrade one affix as I levelled, and then the item would require further character levels before I could craft any further. Fairly typical levelling experience.
That is, until one of my crafting attempts scored a critical. This levelled another affix for free, which should be cause for celebration, except… it has made my weapon now require level 73 before I can use it again. I have no replacement.
Terrible mechanic. Character is more or less bricked.
(Yes I have crappy 2-handers lying around which he can use for now but that’s not the point; this mechanic is poor. When a crafting critical causes annoyance instead of celebration you know your design needs fixed.