G34 Z stepper locking (MarlinFirmware#20091)

Co-authored-by: Scott Lahteine <thinkyhead@users.noreply.github.com>
thinkyhead · Apr 29, 2021 · 9147372 · 9147372
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diff --git a/Marlin/src/gcode/calibrate/G28.cpp b/Marlin/src/gcode/calibrate/G28.cpp
@@ -375,6 +375,11 @@ void GcodeSuite::G28() {
     // Home Z last if homing towards the bed
     #if DISABLED(HOME_Z_FIRST)
       if (doZ) {
+        #if EITHER(Z_MULTI_ENDSTOPS, Z_STEPPER_AUTO_ALIGN)
+          stepper.set_all_z_lock(false);
+          stepper.set_separate_multi_axis(false);
+        #endif
+
         TERN_(BLTOUCH, bltouch.init());
         TERN(Z_SAFE_HOMING, home_z_safely(), homeaxis(Z_AXIS));
         probe.move_z_after_homing();