Content Aware Fill not working if part of layer has no pixels

I have a layer that is 70% pixels, 30% no pixels.

The Content Aware command is grayed out.

If I select the pixels on the layer, the Content Aware Tool opens, but tells me there are no pixels it can work with.

Obviously a bug.

I have to create a white layer, merge the layer with just 70% pixel content, and have then the whole layer with pixels, and then Content aware fill works.

This makes no sense, as I want to fill the zero pixel areas from the pixel areas.

But it looks like Content Aware cannot do that for some reason.

For the Adobe developers, this would be an area of improvement, as such tasks come up quite regularly.