Take a look at this post: the phase diagrams in MP are build from the thermo data, and thus from the energy_per_atom field which will include corrections if any apply. You’ll also need to make sure you use data that’s consistent in the “thermo type” (whether it’s from the GGA / GGA+U mixed hull, the r2SCAN only hull, or the combined GGA / GGA+U / r2SCAN hull).