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The eyedropper tool seems to only work on the base layer. It only selects what is on the base layer and not what is on the current layer selected.
After working on a map last night, I saved it, and this morning, re-opening the map, I wanted to continue where I left off, painting in the floor of this dungeon. But I cannot seem to select the hex I was using on my layer. It selects the base layer hex every time.