The curious case of the square tire.
On May 5 a BA(A380) left HKG with 22 round tires, it landed at LHR with 21 round and 1 square tire - obviously something happened on that flight, but what?
Personally I’m going with BA maintenance going with new & improved chocks

For a photo and a possible explanation see Incident: British Airways A388 enroute on May 5th 2016, the square tyre