Full permission to ext SD card request by Android dont handled

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in example with backup feature in Andoid Assistant witch backups all installed apk.
this app check access to external SD card somehow and ask to select external SD card and tap 'Select' button (norman functiona are limited, Please get permission By the following steps). but when I do it they ask me again.

The conclusion is some Android API function used to track is there full access to external SD card and it fails to validate. Could you HOOK this function and return always "full access already here" in case "Full access to external SD card" enabled in your app.

or to suggest another xposed module that can fix this situation.

thanks.