This relation = Lake Huron Rel1205151 is now >14000 Members big. Its impossible to render it on Mapsforge maps any longer - it binds enourmous resources.
It will be set on the black list of OpenAndroMaps.org Maps till someone finds a solution for this issue.
Generally those great Lakes were not multipolys in the beginning of OSM but defined by coastlines - easy to render with JochenTopfs shape files.
The mess startet when someone made lakes instead of sea-areas by coustlines.