Is it a known issue to have the game completely desync in the middle?

During an online 3-man FFA, somehow our game desynced.  Nothing technically looked out of the ordinary on anybody's end, but the game started developing differently to different people.  For example, on my end it looked like I had wiped out one of the host's planets and all his ships, but to him it looked like he still owned the planet and had destroyed all of MY ships.  Each of us thought we still owned the planet, although we were both able to change the name and the other could see the change.  It looked to me like his ships had been wiped out and ships were occasionally coming in one by one (presumably following a rally point) and getting killed by my ships.  We were basically playing different games with no input from the other.

However, we could still chat with no issues.  The third guy in the game appeared to be desynced from both of us as well, since we each tried attacking his planet and he couldn't see either attack.  It looked like everybody's client still thought things were running smoothly, just with no more issued orders from the other players.

We tried saving the game, exiting and then loading it back up to see if that fixed it, but it didn't change a thing.

Obviously this is a game-crippling bug.  Has this happened to anyone else or are we the first?