Load Reforger on Steam, no mods
Enter a Game Master mode (seems to happen more on dedicated servers than singleplayer)
Attempt to place explosives on something
Observe that the explosives will appear on the floor (as if dropped) or floating in the air
**Not confirmed** but it does appear to happen more often when one uses the F key to select explosives from the inventory rather than using the 4 key to select explosives in the slot.
Overall, the inconsistent reproducibility is making this one hard for me to give clear steps. If you guys have any insight, I'm more than willing to try different repro steps.