Strictly speaking, getting 'motored out' on an EM is definitely not a bug as long as the feature says 'when lit', but they aren't all marked that way. Lot of older EMs weren't very strict about putting 'when lit' on things on the playfield when they really should have.

I figure a lot of the very early SS games didn't really have very many bugs or none at all, given they weren't really that much more complicated than a typical EM as far as the code goes.

Reminds me of the Black Hole glitch where if the ball doesn't go thru one of the top rollovers as the first score of a ball, the scoring/displays can get derailed and go to the wrong player, really goofy. Same result if one of those rollover switches fails and the ball goes thru it. But hey a switch can get dirty too, or the ball can go thru a switch so fast it misses it. I consider the BH example to be a bug since the result is particularly bad. Just a switch failing and not scoring whatever it was supposed to, or the ball getting stuck in a saucer because of the switch, neh. HS losing track of the ball, I think of that as a bug too since it has a consequence beyond the basic everyday glitch caused by a switch failing or not registering.