On the subject of spoiler errors I believe that wormholes don't close when they disappear, and that ships may still use them. These ships are about 200M km apart, and they appeared around the same game tick. I think that there was infact a wormhole down where the southmost group spawned, but it "disappeared". This contributes to spoilers being more dangerous than they otherwise would be(in terms of ship counts, and being able to appear in unexpected places), though the latest change to how they work has somewhat nerfed them in my opinion.
And on the subject of combat, while not technically an error, npr ships that are out of ammunition can still force 5 second increments by attempting to fire(players can do this as well, but we get an error message). I've seen anti-missile ships attempt to do this when I've targetted them with missiles of my own, only to have the 5 second increment problem go away when the missiles targeted on the ship hit it.