Repro steps:

1. 2 players connect to a dedicated server and run a test mission with debug console enabled

2. player Alpha opens debug console and executes:

mortar = "o_mortar_01_f" createvehicle position player

3. player Bravo disassembles then reassembles the mortar

4. After less than 60 seconds the mortar disappears for player Bravo but it is still visible for player Alpha

Note: the same problem happens with other static weapons