I tried raiding a sentinel guarded building - one of those with a reinforced door. First I landed, and noticed it was guarded by two dog-type sentinels. I put down a beacon, then took off and blew the doors open with my spaceship cannon, taking a sentinel out in the process. I flew away until the counter had timed out, returning to the beacon location, planning on entering the building and claiming my prize. But the building was no longer there. I thought to myself:
You’re only supposed to blow the bloody doors off!
No, really, it’s a graphical glitch - I didn’t use excessive firepower. I circled a few times, landed on the plateau at the beacon location: no invisible buildings, late pop-in rendering nor signs of sentinels. Nothing!