Use 0 as the bed position (not Z_MIN_POS)

Marlin/src/gcode/bedlevel/abl/G29.cpp

         enable_soft_endstops = soft_endstops_enabled;
       #endif
       // Move close to the bed before the first point
-      do_blocking_move_to_z(Z_MIN_POS);
+      do_blocking_move_to_z(0);
     }
     else {
 

Marlin/src/gcode/bedlevel/mbl/G29.cpp

           enable_soft_endstops = soft_endstops_enabled;
         #endif
         // Move close to the bed before the first point
-        do_blocking_move_to_z(Z_MIN_POS);
+        do_blocking_move_to_z(0);
       }
       else {
         // For G29 S2 after adjusting Z.
       }
       else {
         // One last "return to the bed" (as originally coded) at completion
-        current_position[Z_AXIS] = Z_MIN_POS + MANUAL_PROBE_HEIGHT;
+        current_position[Z_AXIS] = MANUAL_PROBE_HEIGHT;
         line_to_current_position();
         stepper.synchronize();
 
         set_bed_leveling_enabled(true);
 
         #if ENABLED(MESH_G28_REST_ORIGIN)
-          current_position[Z_AXIS] = Z_MIN_POS;
+          current_position[Z_AXIS] = 0;
           set_destination_from_current();
           buffer_line_to_destination(homing_feedrate(Z_AXIS));
           stepper.synchronize();

Marlin/src/gcode/feature/pause/M701_M702.cpp

 
   // Restore Z axis
   if (park_point.z > 0)
-    do_blocking_move_to_z(max(current_position[Z_AXIS] - park_point.z, Z_MIN_POS), NOZZLE_PARK_Z_FEEDRATE);
+    do_blocking_move_to_z(max(current_position[Z_AXIS] - park_point.z, 0), NOZZLE_PARK_Z_FEEDRATE);
 
   #if EXTRUDERS > 1
     // Restore toolhead if it was changed
 
   // Restore Z axis
   if (park_point.z > 0)
-    do_blocking_move_to_z(max(current_position[Z_AXIS] - park_point.z, Z_MIN_POS), NOZZLE_PARK_Z_FEEDRATE);
+    do_blocking_move_to_z(max(current_position[Z_AXIS] - park_point.z, 0), NOZZLE_PARK_Z_FEEDRATE);
 
   #if EXTRUDERS > 1
     // Restore toolhead if it was changed

Marlin/src/lcd/ultralcd.cpp

       if (!lcd_wait_for_move) {
         #if MANUAL_PROBE_HEIGHT > 0 && DISABLED(MESH_BED_LEVELING)
           // Display "Done" screen and wait for moves to complete
-          line_to_z(Z_MIN_POS + MANUAL_PROBE_HEIGHT);
+          line_to_z(MANUAL_PROBE_HEIGHT);
           lcd_synchronize(PSTR(MSG_LEVEL_BED_DONE));
         #endif
         lcd_goto_previous_menu_no_defer();