Exceptions and allow on the flash player

Why do you tell me that it will last only until the program is restarted?

This is a question for Google, not Adobe, as Chrome is a Google product.

With the release of Chrome 69, the Flash Player settings only remain for the duration of that session.  Once the browser is closed, the settings are removed.

Refer to Google's Flash roadmap here, Flash Roadmap - The Chromium Projects , specifically section 2.2:

Summary

Sites using Flash will require explicit permission to run, every time the user restarts the browser.

Rationale

Require affirmative user choice to run Flash Player content, without that choice persisting across multiple sessions.