If you don't star the planet, you have a second day to do the mission. A lot of guilds are doing that for many planets so they can get more stars. If you don't star it in the first phase it opens, then you can run the missions the second day too. But, special missions, like Reva can only be done one time per TB by anyone.
So perhaps there is some confusion in that?
In the past we were able to do the mission twice if you failed on the first day. On the second day it got reset and you could try again. I remember in Geonosis that was not the case, the KAM and Wat missions could only be done once. Probably got patched and I did not notice since it was a while since I failñed the mission.
