Formula One
In stock cars, excessive brake temperature can "melt the bead" and take the tire down - which is basically a "circumferential break on the inner sidewall" . . . the identified cause of the failures at Baku.
But if it's brake-temp related, why don't they say that? Maybe that's not it but it's weird that they say (1) they know structurally how the tire failed, (2) the tires were being run within the proper pressure and temp specifications, and (3) they're going to update protocols for in-race monitoring. But they don't say what they think caused inner sidewall break.