I know this has been reported before, but wanted to report it again. I actually had mine bug out a little more than normal.
I finished Orendi’s lore, received her item no problem. When I was working on Ambra, I had 4/5 completed and was working on finishing the Solar Wind kills. I actually had the trophy for completing her lore pop at 200 Solar Wind kills. Went into character challenges, and it showed the challenge for completing Ambra’s lore as complete, but without a check in the box.
Finished the Solar Wind Kills. Now her lore page is completely finished, no gear drop.
I hope these can be retroactively provided later.