I've noticed this with pretty much every blueprint that drops in world, if you pick it up while controlling mech it just goes into the void.
I have not compared my inventory after the mission to see if I actually did get them or not, but I'm not taking chances.
I also don't know if this affects other purple-line items like shedu parts and it's concerning.
Here's one example proof:
Item is not there because I already picked it up (I also have helios with vacuum