Playing around with http://cycle.travel/map I discovered some dry lakes.
Lake Geneva, Lago Magiore, Lago di Lugano and at some zoomlevels the Markerwaard (North-East of Amsterdam). Maybe there are more problems, but I did not check the whole world.
I checked it on OSM and it looked OK. But on OSM there is something wrong with Lac de Neuchâtel. On some zoomlevels there is no water.
I don’t understand what’s wrong,but I do understand there is something wrong.
Peter