Hi, thx for this feedback.
My intention was to get Donaustadt visible on the map like other Vienna's districts.
When looking at: 
- Essling (https://www.openstreetmap.org/node/455421863), 
- Apsern (https://www.openstreetmap.org/node/322276743), 
- Stadlau (https://www.openstreetmap.org/node/455421870)
And other districts I tested, they all exist as Node and displayed on the map.
I reproduce same for Donaustadt.
What did I miss?
thx