User GPO logon/logoff script definitions are stored in an extra place. They are not part of C:\windows\System32\grouppolicy\user\registry.pol nor they can be exported my secedit.
They are store in
dir /a:h C:\windows\System32\grouppolicy\user\scripts\psscripts.ini dir /a:h C:\windows\System32\grouppolicy\user\scripts\scripts.ini
both files are hidden. psscripts.ini are the Powershellscripts and scripts.ini are batchfiles.