Proxy’s mines can cause a heavy fps drop (~20fps) on the server which is noticeable for all players and makes the game unplayable.
The bugged mine makes a high pitched sound which lasts as long as it gets removed. You also can’t take the mine back, so destroying is the only option. As soon as you destroy the bugged mine the fps rate of all players will go up again.
I haven’t found out yet what causes the bugged state of the mine. Time or position could be a factor I guess.