Qiyu Yan yanqiyu@fedoraproject.org wrote on Sat, 01 May 2021 14:40:34 +0800:
It not the last installed becomes the dafault, but the one with highest version nummber. And unluckily, there is a kernel downgrade with the upgrade from f33 to f34.
That explains it. The recent F34 update to the 5.11.16-300 kernel restored my default boot kernel to F34.