icon missing from woodland mansion map

house icon missing from woodland explorerer map

I wanted to explore a woodland mansion by traded map from cartographer

But the woodland map had no house i con indicating the mansion 

1).  I traded a Woodland explorer map from my cartographer

2).  As I opened the map it had no mansion icon in it 

3)   Either ways i went to the place it showed in the map but still the icon wont appear on the map

4).   I also went and tried to change the scale of map to 1:16 ut still it did not appear