PSA: Silverblue 32.20200702.0 update fails on several computer models, unable to rollback

I have been using Silverblue 32 on my mid-2015 vintage MacBook Pro Retina edition (15" screen). I initially had this set up with two EFI partitions - one for macOS, the other for Silverblue. After running rpm-ostree update past 32.20200702.0, the Silverblue partition failed to reboot. Worse, I could not recover via GRUB, selecting the prior kernel, and doing an rpm-ostree rollback.

I reported this to Red Hat Bugzilla [1]. It appears that there is a Github issue on the Fedora CoreOS issue tracker that may be related where this is happening on HP and Lenovo models [2].