Anti Tank Mines Disappear After A Few Seconds

Resurrecting this thread to mention that it still keeps happening. 100% of the time in Breakthrough when the defenders get pushed back to a new sector. The mines don't explode, they just disappear. I have to wait for the second siren to sound to lay them down and not disappear, which is pretty inconvenient.

Also I'd like to add that it's not just anti-tank mines. Basically any deployables - claymore disappears, Irish's sentinel and cover break down without anything shooting them.