Mobile Defense Satelittes don't take damage

[(XBOX)SIoth the Sin]

Neptune, tileset: Salacia

The mobile defense satellites don't take any damage when enemy's attack them. To test this I flew away from the satellite, into another section of the map, to see if it would take damage. It didn't. Not sure if it's a bug or not.

[(XBOX)R3d P01nt]

Did any enemies even make it to the satellite to attack it?  Having played a few rounds of Salacia yesterday to farm ALUs, it seemed like a pathing issue that wasn't allowing the enemies to make their way to the satellite.  I had to continually go and track down enemies to kill them for ALU drops.

[Beuargh]

Same thing for me, 2 out of 5 runs (zero damage is new to me on PC). The slowness of the mobs is distressing since Razorback, we can defend a
satellite without defending anything because the mobs remain blocked, do not come or hardly come into contact: we often have to go back and hunt them (ie C ALU, mods, xp). 
It's + simple for a beginner who comes xp his stuff: so much the better. But it's so boring.