Crafting and golding out a new piece of gear at CP150 accidentally. And then trying a second time, only to forget the trait.
Also; having a guildie craft me some nirn armour pieces to research, and then accidentally deconning them when cleaning up my inventory because they got lost in the pile of white quality items. Yup.
Finally doing No death run on vet Vaults of Madness, only for the achievement not to get recognized. I’ve given up on trying to do a speed run on that dungeon.
I never expected building too many characters in the beginning and I was stuck on magicka, so when I made my first stam character is really missed the Briarheart items I deconstructed .