>> Doing a bit of googling, /boot/grub2/grubenv file cannot be manually
>> edited.  Use the following command instead: 
>> [root@host ~]# grub2-set-default 0
>> [root@host ~]# grub2-editenv list
>> saved_entry=0
>> That 0 should mean the most recently installed kernel.

(I should add that the set-default command sets it, the subsequent list
command line just confirms the change.)

Not Random:
> Thank you so much Tim!  When I ran 'grub2-set-default 0' again and
> ran grub2-mkconfig it seems to have worked!  I've rebooted twice and
> the system seems to work.

Interesting.  The page I found the info on didn't mention using
"grub2-mkconfig", so I wonder if it's necessary.  You could try setting
the default to 1, then rebooting without using the mkconfig thing, and
see if the set default command works by itself.

(I'm not in a position to try this myself, just at the moment.)
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