Impossible to complete Mobile Defense mission

[tprx]

I was doing a solo mobile defense mission (the syndicate version). Every time I completed an objective, I went exploring for medallions, leaving the data mass at the last completed objective. At the second, the data mass sunk in the floor and was not available for retrieval when I went back. I've noticed on previous missions that at that position, it was sometimes almost impossible to pick up the data mass even when you were waiting for it. Here's the location:

The data mass doesn't even show on the map anymore. I did finish my Riven challenge, but got no other rewards (including rep) from that mission.

[ausenforcer]

Was just coming to make a post about it. Here's my experience...

Data mass swallowed by floor - Aten, Void