land mine markers get garbage collected / despawn while mines stay as expected. this makes no sense!

this affects also the stable version - not only the experimental brunch.

I guess, it was not recognized, cause nobody was using this markers. But nowadays - since FIA blow up containers and sneek in the bases - it makes sense to use the markers to show the own side and enemies that areas around containers are ap mined. And the markers are usefull for psyops. but if they get garbage collected - this mine markers make no sense in the game.