Well if you don't have a screened bottom board, put a couple twigs under two corners of the telescoping cover so it lets warmer air chimney out the top a little bit. Or use/make an Imrie shim. Or use a top entrance.
And sure, the bees do know what they're doing. But please consider: their knowledge is based on having developed their hoarding behaviors WAY before we beekeepers were feeding gallons of sugar syrup to them right inside their house .