I started a new game under 0.6a today and attacked a Pirate Plunder Fleet. The first round of combat proceeded normally with me destroying all their non-mothballed combat ships. On the post-combat screen it showed several freighters remaining in reserve and that the Pirate Fleet is moving to engage again. Upon entering the second round of combat, no enemy ships were deployed and the battle was immediately over. On the post-combat screen it showed the freighters remaining in reserve again with no CR loss. The pirates would again move to engage and not deploy anything again. The only way to break the loop was to either disengage or harry them until they ran out of CR, forcing a pursuit scenario. Attacking a second Plunder Fleet led to the same loop.