This has been discussed in other threads (previous threads: Picking up Items in a level doesn’t add them to my inventory as expected?, Is it possible getting the equipment in Gems or Death?).
Although this is “working as designed”, I believe this specific case would warrant an exception. So here is a feature request that does not require any changes to the game engine: add a bonus goal that is to reach the equipment position in the map, and reward accordingly.
What do you guys think?