Hi Dave. Here's a screenshot of my Startup folder.
(The full path for this folder is: C:/Users/%UserName%/AppData/Roaming/Microsoft/StartMenu/Programs/Startup)
The three spreadsheets and the BlueStacks 5 app always opened when my PC booted. On or about about 3-8-23 they stopped opening at bootup and I had to manually start them.
Additionally, I have four apps that were set to open at bootup in their individual settings. They also stopped opening.
I did follow your instructions which added another shortcut to the Startup folder. It also failed to open on bootup.
I went to Settings-Apps-Startup and set the apps I wanted to "On" and rebooted but the apps failed to open and in Settings-Apps-Startup the were all set to "Off".
I'm still thinking I need to uninstall the 3-7-23 Windows Update and/or do some kind of Windows repair.