verified against 4.7.33, the new rhcos image 47.84.202109241831-0 is used as boot image, it works well, and also not detect bootstrap failure in recent QE CI jobs, move bug to VERIFIED.
[root@ip-172-31-249-235 ~]# rpm-ostree status
State: idle
Deployments:
● ostree://855dbb83e02cb2f2b627082f678936ee5c9a3b21e0eb3ac7667787102d13e316
Version: 47.84.202109241831-0 (2021-09-24T18:34:26Z)
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory (OpenShift Container Platform 4.7.33 bug fix update), and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://access.redhat.com/errata/RHBA-2021:3686