But you’ll have other great sequences. For example once I got 3 Dwarven Armorers from one level. One was from the final boss and two from the bonus chests spawned throughout that level.
Personally I keep the bonus chests untouched until I finish the level (unless 4 are spawned and I need to make space), so I’m aware of how lucky I am. Fortunately (at least in the app) there is a warning when I try to advance a level and still have some unclaimed chests. And no, I wasn’t testing that on purpose.