Hello Mutzi,
I understand how frustrating it is to repeatedly lose your carefully arranged Start menu pins after installing updates.
Microsoft’s available release information does not currently list the deletion of Start menu pins as a known issue with KB5101684. However, since you observed the same behavior on multiple systems and after earlier updates, it might be an unconfirmed update-related regression.
Please report it through Feedback Hub under Desktop Environment > Start menu, including:
- KB5101684 and build 26200.8973
- The earlier affected builds
- Whether the systems use the redesigned Start menu
- Screenshots before and after restarting
This will provide Microsoft with the diagnostic data needed to investigate. For now, I would avoid reinstalling KB5101684 solely to test this again, since there is no documented fix yet.