saying heat caused it, one article mentions there was another road that had a buckle in it but not as severe. It it was a water main break i would have though there would be water somewhere.
https://www.ky3.com/2025/06/23/cape-girardeau-mo-road-buckles-heat/
https://www.kfvs12.com/2025/06/22/siemers-drive-buckles-during-summer-heat/