It needs to be adapted to 3D floor/midtexture combinations as well.
thingz_spawnrespawn_09.wad
1. zdoom -iwad doom2.wad -file thingz_spawnrespawn_09.wad +sv_itemrespawn 1 +map map01
2. Go down to the chainguns on the leftmost row and pick them up. Note that it can be difficult to pick them up when they're between the 3D floors and midtextures.
