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Unfortunately, as was the case in October, this is mistakenly being deployed to all Pro machines, regardless of whether they are registered or configured for Windows Autopilot deployment. This time round, Home is spared.Note Windows Autopilot update is not installed on Windows 10 Pro or a later version when the device is not registered or configured for Windows Autopilot deployment. Windows Autopilot update is never offered to Windows 10 Home.
KB4523786 Cumulative update for Autopilot in Windows 10 v1903 Oct. 22The KB4523786 cumulative update has been pulled and is no longer being automatically installed via Windows Update since Microsoft released it by mistake to Home and Pro editions on personal computers.
Also, once installed on Pro it will install again (and again) each time you check for updates. Uninstall it and it will just come back.
Until MS pull this one too, it can be hidden using wushowhide.diagcab.
Hide or Show Windows Updates in Windows 10