UserAgent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:53.0) Gecko/20100101 Firefox/53.0

Steps to reproduce the problem:
Go to a site of the Flash Player settings manager for example at http://www.macromedia.com/support/documentation/en/flashplayer/help/settings_manager04.html

What is the expected behavior?
Either the settings manager should appear or Chrome should ask if the Flash Player should be executed.

What went wrong?
The website shows "This content requires Flash" and provides a link to get it.

Did this work before? Yes 

Chrome version: 58.0.3029.110  Channel: stable
OS Version: 10
Flash Version: 

I noticed this issue the first time after Chrome did begin to ask on sites if Flash should be executed (I think it was Chrome 57).

On the settings manager only after clicking the link to get the Flash Player Chrome asks if Flash should be executed and then the settings manager works as expected so it seems Chrome does simply not detect that the site did already try to load a flash application.

Also if I'm not wrong Chrome does whitelist some sites which can execute flash applications without requiring the user to whitelist the site with the popup but I'm wondering why the settings manager of the Flash Player isn't whitelisted too.