Quoted from Frax:

I've got this beat, but I've never seen a ball under the fully lowered cover like that LOL. At least this error should have resolved itself if the ball was able to fall out when it came back up?
I was playing IM in our local league, and I swear to god... the game was already notorious for capturing one ball with the monger cover, but I went the extra mile. I batted two balls away to give myself some time after the last monger hit to lower him for the SJP, but bad bounces meant that they ended up right on the edge of the hole just as the cover came down on them. One lipped out the other was trapped. So I end up with 2 balls on the flippers. Okay...fine...rule was to play through it but had to try to free the ball? Dumb IMO, but sure, let's try that!
Shot from right flipper backhand into now captive ball, and that ball lodges under the cover as well.
Shot from LEFT flipper, screwed it up and hit the now leftmost ball on the left side and OH LOOK NOW ALL THREE ARE WEDGED IN FRONT OF THE MONGER.
/facepalm For whatever reason, the game never raised the bloody monger to release the balls. We decided to play a different game after getting some oxygen because it was so ridiculous. I love IM, but that mech is nothing but trouble!