The bug still happens even in healer stance though - if the enemy has afflicted the chocobo with a negative status effect that kicks around for ages (such as poison stacks), but the chocobo is unable to remove the effect, it will keep dancing around trying to heal but without success even after the battle has technically ended, it will lock the chocobo in battle mode (with the battle music still playing and HP/MP/TP recovery not occurring as normal). As mentioned usually the only way to fix the problem is to dismiss the chocobo and then call it again.