759a996d610d before AND after an upgrade

From: Graham Perrin <grahamperrin_at_gmail.com>
Date: Sat, 24 Feb 2024 14:44:46 UTC
main-n268493-759a996d610d for two boot environments, as shown at 
<https://gist.github.com/grahamperrin/86359cb7c6d1316d75f340fb305484ed>.

I can't understand how this (sameness) might occur. Any suggestions?

TIA