Sorry - typo on my part, I meant DMap, not PMax.
This is the partially processed DMap output, using the same input files. It was not as sharp as the PMax processed version, so I went further with the DMap image.
I understand the physics of what is happening to create the halos. With focus breathing of the lens that close to the subject the two images are not identical in size, so the stacking software makes certain assumptions as it blends the two images. The interpolation algorithms are likely responsible for this effect and it can be taken out with a bit of care in post.