Hi, thank you for bringing this to my attention. I believe it may be due to how RPG Maker default code queues common events, using a temporary object that is not part of save data. This means if a save occurs before the event can start running, the queued event will be lost.
Under normal RPG Maker circumstances you probably don't run into this issue, but when something gets queued right at the end of battle when it can't run and then an autosave occurs you notice it.
I will look at what I need to do to these battle common events to make sure they run after loading an autosave.