I have tried to add buildings from WFS layer. https://kartat.espoo.fi/teklaogcweb/wfs.ashx (building layer is GIS:Rakennukset)
Geometry never shows up. However, map extent and data in attribute tables seems to be correct. Also, QGIS doesn't give any error message.
I have been so far able to track down that WFS layer contains different geometry types which seems to be problem for QGIS. I tried to save as GML and then select only polygons, but geometry still doesn't exist (extent and attributes are still fine).