and what would you suggest as an alternative?
removing them from the dungeon and....?
find them where.
when.
how.
this is not a bug, there is nothing wrong in this content of the game.
you just have to put time in it.
just as you put time in bringing all your crafters to 50 and/or at 4 star craft.
it's not like "ah, I have gained access to 4 star crafts, now I can be lazy and must have everything without effort".
you didn't win the roll? sucks. but who cares. you can just make money with your crafters, go buy materials on the MB/Ixali/Auriana/whatever
and buy them.
your logic of "I have all the crafters at 50 so I should have all the crafting drops" is silly.
go farm dungeons, if you need the crafting material.
you farm dungeons--->you obtain your crafting materials---->you obtain nexus lights.
win/win situation.
embrace the mantra "another useless post in the forum, is a loot lost in a dungeon"