I accidentally digitized a layer (geopackage) in WGS84 (EPSG 4326). Now I need to reproject it into ETRS89/UTM zone 32N (EPSG 25832). I tried it in different ways which usually work without a problem (saving layer as esri-shapefile or as geopackage layer with the updated projection). But in this case, the resulting layers cannot be displayed (see screenshot with the resulting layer's properties).
What am I missing here?