The healing brush (content-aware/heal/clone) has inconsistent size

I have Lightroom Classic v12.0 on an M1 chip MacBook air (12.6)

When the mouse is in the healing panel, the brush size seen in the image is the same as the width of its stoke (seen here with a clone selection).

When the mouse is over the image, the brush size becomes much larger. It is confusing because as you brush, the brush stroke comes out smaller than the brush head. I think that the brush size has been rendered wrong.

The brush size should be consistent regardless of where the mouse is.