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I have yet to see a crystal bomb in my game, so I guess these are an element of higher levels normally.
I see you have spotted the level 136 post about how the change to the bombs made the level unplayable and @Johnny_Crush post saying that the change to the bombs has made a few levels unplayable.
When they were working on Sam's Streak and the Chocolate Box last year to make them 'better' (their words not mine 😉) these features kept disappearing and reappearing and generally acting odd.
The moves bombs aren't well liked and I wonder if this is King's way of acknowledging that. The moves bombs would be better if they just changed into a blocker instead of ending your game immediately. It would have the same result overall, but people might think the blocker gave them a chance.
As you know no one here can actually answer your question and those that could won't.