It's also odd that the crack is at the #3 cylinder, which is also the cylinder that the bad injector fell apart in!
It's only 5000 miles out of warranty, I would maybe get BMW involved if the dealer isn't going to do anything. Really, not too many choices, either fix it, get a short block somewhere if the dealer is willing to do the work.
Did you see the damage, and if so how big/where is the crack?
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