Did the capsule survive for a bit?
Look at 23:48 in this video https://youtu.be/ZeiBFtkrZEw (linked previously by someone else). Something cone shaped and roughly dragon capsule shaped comes falling through the initial large "explosion" cloud.
Maybe the capsule survived the initial blast on the second stage, but got destroyed in the destruction of the first stage? (Or made the plunge, didn't deploy chutes and didn't survive the hydrobraking)