Obtaining the UUID of a Named Clipboard (thru JXA or AppleScript)

When using ComplexPoint's script to obtain the uuid of a named clipboard (https://forum.keyboardmaestro.com/t/get-text-from-named-clipboard-from-km-use-in-applescript/9145/5), I discovered that some (seven) new named clipboards created via AppleScript and xml -each containing an image- are not listed in /Users/tsukadjed/Library/Application Support/Keyboard Maestro/Keyboard Maestro Clipboards.plist Can you tell me what I am doing wrong so I can (1) update the Keyboard Maestro Clipboards.plist and (2) paste named clipboards? The newly created named clipboards are seen when using the KM editor but they are not in the Clipboard plist.