OL+ Blockswitcher radio buttons not visible when using sidebar block

I've been trying to place the blockswitcher into a block and display the base layers with their radio buttons. I can get the base layer names to show, but no radio buttons. However, when the base layer is clicked, the correct behavior is applied.

When I configure to place the blockswitcher into the map, the radio buttons are drawn correctly.

I feel like I'm missing something something easy and could use some direction.