I just tried to remove all germany updates (WU and CU) and re-install them one by one. With CU installed but without the WU 6 it works fine, but then the handcrafted EDDS airport is not included. After installing WU 6 it is broken again.
Also after deleting just EDDS (v 1.2.3) arrival and departures are populated again. As soon as EDDS is installed again, they are empty.
Could you confirm that you have WU 6 fully installed including the Microsoft EDDS airport? I do wonder what the difference is between our installations.