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Link here. According to Musk, the reason the core stage hit the water so fast is that some engines did not fire as intended.
He said engineers believed only one of three engines fired during a final burn designed to slow the rocket’s descent before touchdown. The stage only missed the boat by about the length of a football field, but the force of its water impact was enough to “take out” two engines on the nearby drone ship and spray it with debris.
This is proper engineering procedure. They flew a test, and learned something. They now need to figure out why it happened, and fix it.