Fixed bug in ScanOptimizeFW PBEsol step

Author: MichaelWolloch

atomate/vasp/fireworks/core.py

@@ -258,7 +258,10 @@ def __init__(
                 WriteVaspFromIOSet(structure=structure, vasp_input_set=vasp_input_set)
             )
             # Update the INCAR for the PBESol GGA preconditioning step
-            pre_opt_settings = {"_set": {"GGA": "Ps", "METAGGA": None, "EDIFFG": -0.05}}
+            metagga_type = vasp_input_set.incar.get("METAGGA",
+                       vasp_input_set_params.get("METAGGA", "R2SCAN"))
+            pre_opt_settings = {"_set": {"GGA": "Ps", "EDIFFG": -0.05},
+                                "_unset": {"METAGGA": metagga_type}}
 
             # Disable vdW for the precondition step
             if vasp_input_set_params.get("vdw"):