POM & Lightmaps, does it work together ?

Hi,
I'am facing a problem when trying to use lightmaps and POM together.
I think its because we can't parallax lightmaps right?

The results are black borders where two planes with the same material intersect.  


So, pretty resealable for me to think there is no fix for this.
But how can I achieve a similar look to this without POM ? Tessellation  maybe ?

EDIT 1: i just realised its not a lightmap issue, but the dynamic shadow it self.