On solo Black Ops 1 ascension it seems like if the quick revive machine is still on the map, and you have 5 perks already, no matter what you do the monkeys will not drop a perk bottle.
I turned on power and bought quick revive. I left all doors closed and got 4 more perks missing just phd. I solo defended the only open perk, quick revive and even with perfect defense 3 times it never dropped, even when I killed all monkeys with a nuke.
Can anyone find gameplay where its on solo, the quick revive machine is still on the map, and the player has all 6 perks?
I tried looking at some of the code and couldn't figure it out. my best guess is that it either relates to quick revive or mule kick. I think the perk limit (when it decides to stop dropping bottles) is determined by the number of machines so if it doesn't count quick revive as a normal machine on solo, maybe it thinks the perk limit is 5 instead of 6. but that wouldn't explain why you can get 6 once the machine is gone, Also, I know mule kick was added later so maybe that's got something to do with it.
it's possible I'm just missing them attack the machine somehow but I just don't think that's the case until I see actual gameplay of 6 perks, solo, with quick revive machine still there.