After updating from MacOS Mojave to MacOS Monterey, standard apps being freshly downloaded via webbrowser as .dmg file (not via App Store) don't start anymore, e. g.
The effect (always reproducable) is the following: A new dock icon pops up dock bar, keeps bouncing for about two minutes, then it stops bouncing, but neither the app starts nor an error message is shown. In parallel, a warning "CoreServicesUIAgent Connection from process XXXX does not have the required entitlement com.apple.private.iscsuia" is logged in the system log (this is always reproducable).
What can be the reason that none of the apps are starting?
What could I do to make them working again?