Are these tiles that fell off? Perhaps SpaceX should study them as some fall off during launch. It would be helpful to examine them & find out why some fall off.
I'm guessing that most of these are from the first launch and came off as the ship FTS activated so we'll see what future launches have happen. Honesty, the amount of tiles that came off on the 2nd launch bode well for SpaceX's Starship success, the tiles are a make or break item for the program.
Decades worth of trash and a stuck vehicle most likely. These beaches are almost made of trash at this point with some sand mixed in, it's bad out there. For some reason, either the wind or currents, the Texas/Mexico beaches in this area are the Gulf of Mexico's trash can.