Windows 10 tweaking, somehow I broke context menus for taskbar icons

Hi guys. Any idea which registry setting might cause this problem? I'm currently optimizing Windows 10 2009 with VMware OSOT and somehow I broke taskbar icon/element context menus by adjusting some string I'm not aware of having this effect.

Any pointer would be helpful, thanks!

It should look like this:


But now it looks like this:


Edit: For additional info, my HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced looks like this:

J,

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Denis

I see what you see after some updates.
Then using the link concerned starts to build up its list again.
I think it is just Version updates that reset it for me but that optimising tool you mentioned might have the same effect for all I know.

I could not find any tutorials that explained this behaviour [there's a link at the top of the page] but I did not search for other threads that mention it because I could not think of a decent search term.
https://www.tenforums.com/search.php?query=

I found one tutorial [but not about your problem] in which some of the individual posts seem to me to relate to your situation
Taskbar Thumbnail Threshold to Show List - TenForumsTutorials

Denis