I don't think you understood. It's not that there is a delay. Files SOMETIMES launch in the WRONG ORDER. The order of files IS a feature in this action, so it SHOULD work.
So yes. There is a bug.
The delay-part was just a suggestion for a quick workarround that maybe could help...
Your suggested solution would clutter up what's already quite big worklflows, that also need to be quickly changed, so that's a no-go for me...