I am using QGIS 3.0 and loaded a polygon layer from a shapefile containing more than 300,000 polygons. When zooming in some polygons are not drawn (not the entire layer). 
Answer
This could be caused by geometry errors.
QGIS Processing Toolbox offers two tools which help to diagnose and fix geometry errors:
Use the Check validity tool to process data into valid, invalid, and erroneous geometry.
Use the Fix geometries tool to repair erroneous geometry.
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