I am having the exact same issue when publishing to html5. I see that inserting the video as an event video does fix that problem.
However, I am relying on my video to be used as a slide video because I need the slide and video timing synced so that I can display other objects (text, buttons, etc) at certain times during the video. Has there been any other working solution found that would still allow me to insert my videos as slide videos?
Thanks,