Well the completion bug is per planet. Since I only have one production planet, it took proving that extractor submits caused the bug not to show up. Once I did that, I set up one planet at 3:55 eve time to have the bug by doing all processing submits last. Then I did my other 4 planets extractor submits and the results came in this morning.
Instant completion on all production during downtime.
At this point there's not much left to prove about this mechanic, except to test it outside of the narrow time band I'm currently testing it with. Which I'll do over the weekend. At least I've moved off starting my tests at ridiculous hours in the morning.
Aside to CCP: Originally PI derived blue prints were a) research-able and b) the items they built were reprocess-able. You originally screwed this up by a knee-jerk reaction to the reprocess debacle you engineered by your screwed up deployment plan (CCP Chronotis I'm looking at you and/or whoever you were listening to). Are you ever going to move those BPO items off the type of material definitions they currently have back to the type that have waste and are reprocess-able?
p.s. a knee-jerk reaction is best described by removing the word knee...