Blast Pit, Silo D. At the very first airlock if I enter with a medkit, and push the button inside, as the red light glows up the medkit vanishes. No matter if I hold it or if it’s on the ground. If I push the button again, to open the outer door, the medkit reappears though.
I tried this with a steel barrel for example, but nothing extraordinary happened then.
I guess medkits are not allowed into the central area.