I think I might have found an apparent bug on code v1.05.
So I had Mummy Multiball (MMB) ready to go (ball locked, inserts flashing in sequence) and also 2 balls locked towards Trooper Multiball (TMB).
I hit the sarcophagus newton ball which released the MMB locked ball from the sarcophagus, at the same time my shot ball travelled up the inner loop to lock ball 3 for TMB. Both balls ended up locked in the inner loop for TMB.
The game then proceeded to start TMB but loaded 2 additional balls into the upper loop first, so I had a 4 ball TMB.
Once I was drained back to a single ball (TMB ended) the MMB was still setup like it was ready to start (flashing red insert, etc.) but hitting the sarcophagus newton ball did nothing. I think it failed because there was no longer a locked ball in the sarcophagus lock to hit the switch at the back of the sarcophagus lock “trough”.
In this case it should have detected the hit on the newton ball and started MMB by launching a second ball into play, I would think.
…an even better idea would be to let the player stack both MB if they can pull this shot off.