Since you asked for a "report" on this topic, I have prepared a summary of this feature request and its importance for system administrators. đź“‹ Feature Report: NAS-125176 Automatic Snapshots During OS Upgrades
NAS-125176 Status: Feature Request / Suggestion Platform: TrueNAS SCALE / CORE 🔍 Executive Summary 125176
You can view and vote for this suggestion on the iXsystems JIRA. Since you asked for a "report" on this
While this specific automation is a popular suggestion among the community ( TrueNAS Community Forums ), it is not always enabled by default in every version. Until this is fully integrated as a "toggle"
Until this is fully integrated as a "toggle" in the UI, include a Boot Pool Snapshot as a standard step in your maintenance checklist.
Updates to storage OS can sometimes break specialized network drivers or plugin configurations; snapshots allow for "one-click" restoration.