And one question remains - why are there so many extensions that do not show any NSOpenPanel and are still able to create files?

Hello, yes, exactly. The real SD card fails (most of the time…) but the image works fine. Regards, Sascha

Doesn't work. Step 3: After I have unchecked the box in the developer portal and click Save, the value is restored when reopening the page.

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Hello, thank you very much for the response. I uninstalled my app and then reset all permissions. After reinstalling the app I granted Full Disk Access again and now everything works as expected. It seems like Full Disk Access still has higher priority (which is what I expected 😀).