今回の事故＞＜
ASN Aircraft accident Boeing 737-89P (WL) B-1791 Tengxian, Guangxi https://aviation-safety.net/database/cache/2022/cached-20220321-0.html

"...the descent started between 06:20:43 and 06:20:59. Altitude datapoint show the descent stopped about 06:22:00 around 7400 feet and the aircraft climbed to about 8600 feet before the aircraft again entered a steep descent. ..."