Quote
Scott1326
Update:
Interestingly, when I turned off MESH_BED_LEVELING and enabled AUTO_BED_LEVELING_BILINEAR, I was able to get proper data from the Z probe repeatability test.
That is very strange! M48 definitely should work with Mesh Bed Leveling. And in fact, the Marlin UBL branch is really Mesh Bed Leveling at the foundation. It works fine with M48.