The hexes are in the Map Container. As mentioned previously, I tried removing/disabling all components such that Main Views, Map View, and Map Container have only RectTransform and nothing else. I also stripped down the hexes to have only RectTransform.
In my previous test, I disabled all but 1 hex (which made the quads show up), then removed all components from that hex and duplicated it ~1000 times before the quads disappeared again (all inside Map Container). If I disable Map View or Map Container the quads show up.
The STM with the quads is the selected Super Text.