Recently I went through an interesting bug: if you go to the hatchery and tap(maybe works with any egg, but for me it happens on a terra egg) an egg just when the egg reaches 0 seconds, the game crashes

The game will let you hatch the egg when you open your game like nothing's happened

I've done that and it hasn't crashed my game.

It used to happen to my game often, it would do it during heroic races when I'd be hatching terras quickly, that's the only time you would ever notice. But hasn't happened in a few months now.