Patrol Misson: Cant finish Beta Thorindar, stuck at 4/5

molen

Sometimes when you do the patrol mission in the Beta Thorindar system in Tau Dewa you get stuck at wave 4/5 despite killing all enemies in wave 5. I know enemy ships sometimes cloak but I've hung around for several minutes after killing the last enemy and nothing shows up and you are forced to leave the the mission unfinished.

I just did the mission four times and it happened in two of them.