US Great lake dissappear at zoom level 5.

User’s note and problem visible:
https://www.openstreetmap.org/note/494291#map=6/44.056/-88.594

The lakes reappear after zooming in.

Mapnik does not render water multipolygons at this zoom level (<5), no matter how large they are.
See this changeset. https://www.openstreetmap.org/changeset/36168902

A lot of other water multipolygons which probably should be displayed because of his size, are not displayed because of this mapnik behaviour.
https://github.com/gravitystorm/openstreetmap-carto/issues/754