GRUB2 entries missing / misconfigured / etc?

[ylluminate]

Following an upgrade / cross-grade from CentOS 7 to AlmaLinux 8, I'm having 
some trouble with the GRUB not being able to boot properly for lack of finding 
/ generating entries. I'm hoping to resolve and document this in order to 
further help the folks at AlmaLinux and cPanel on their ELevate upgrade 
progress and am hoping to ask for some GRUB community eyes on this issue to 
nail down what may be going on and how to resolve it:
https://serverfault.com/questions/1103555/how-to-recover-from-the-grub-losing-its-entries-and-faced-with-only-grub-at

Appreciate any input / help!