It seems that the top of the booster fell off when the booster tipped over after a wave hit the droneship. Hopefully not typical.
The bottom portion (RP-1 tank), the landing legs, and the engines stayed on the ship. Octagrabber sustained some damage.
Photos from various Florida Spaceport photographers:
Videos from NSF Space Coast Live:
Anyone else is surprised by how rusted the barge is‽
No, it lives in the ocean and is made of steel
They should make it out of stainless steel with sub 10-micron tolerances.