Then double-click at "Truppenübungsplatz" and the official data of the area is highlighted again. 

View Screenshot:
https://i.ibb.co/N3dTscF/Bildschirmfoto-2021-02-13-um-11-08-36.png

This border is now made from the official administrativ geo database, based on the official land registry of Upper-Austria. – in this case of the military of Austria.  