hides permalinks, does not delete

Hi, I find that your plugin hides the permalinks when active. There is no need to refresh the Permalink Settings, as your instruction says.

But when your plugin is then deactivated, those permalinks return, also without refreshing them in the Permalink Settings.

While the plugin is deactivated, refreshing the Permalink Settings will change the URLs as expected.

I wonder if there is some other thing in my installation that is regenerating them? I have Yoast SEO, but the Media and Attachment URL settings are all set to NO.

Is there a solution to permanently delete media file permalinks?