Have you run disk cleanup which may have remove uninstall files?
I test going backward on both KB5000842 updates.
I start with 19043.906 and use Control Panel to uninstall KB5000842 and build turn to 19043.899.
Now CTRL panel show KB5000842 again, but another date, uninstalling that and build turn to 19043.867.
Next I use Windows Update and get directly back to 19043.906.