same here. I actually played through both campaigns before I encountered this issue. I was replaying Adapt, and it happened to me in the second mission hub (can't remember the name). I reverted to the first mission hub (Bomos?), and it affected me there as well. I just restarted Adapt, and again I had this issue when I got back to Bomos

I have the same problem using the current dev branch. I thought they weren't working at all, but now after testing I can confirm that I can use them by pressing B, however they don't show up in my inventory

if 'overlapping' is such an issue, why are they available in Zeus?

I don't know why they (Objects: Lamps) were removed. but the thing is, they're in 'Zeus', so why not the standard editor?

"Objects (Lamps)" used to be in the editor (before July?). not sure why they were removed, but are they ever coming back?