On the Amberley map, I set up a scene where your character is settting up a command post/ base camp. I have set up that items get beamed in, including generators. It all works except the generator does not appear.
I have done something in the same manner with the generators in Floods at Home Pt1 (ST-HN9CS9IDR) on the Rockhampton map and it work fine, but I did that map before season 4 launch. It is only after I had the issue of no generators appearing after season 4.
I had this problem in the editor playthrough and when I officially published it, after foundry was back online after season 5.