Export shapefile from spatialite

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I am using a spatialite db to perform a union and dissolve over a vector file.The vector inside the db looks like this:

when I export the table with: ogr2ogr -f "ESRI Shapefile" -overwrite output.shp db.sqlite -dsco SPATIALITE=yes -sql "SELECT * FROM unidos" -nlt MULTIPOLYGON

the resulting shapefile has some of the holes filled, like in the next image

What can be wrong? I have checked the input file and it is OK. I mean, the holes are actually holes.

Thanks.



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