FIX: fix a status synchronizing issue

Change-Id: Iefec80b8a48d0e86e4cf2d15ca00b9bfdb7b0c4a
Signed-off-by: Stone Li <stone.li@bambulab.com>

src/slic3r/GUI/DeviceManager.cpp

@@ -2308,6 +2308,10 @@ void MachineObject::reset()
     extruder_axis_status = LOAD;
     nozzle_diameter = 0.0f;
 
+    // reset print_json
+    json empty_j;
+    print_json.diff2all_base_reset(empty_j);
+
     vt_tray.reset();
 
     subtask_ = nullptr;