Set SDPAUSE state on M600 regardless of prior TFTstate

Move the routine to a better position and set the state regardless of SDPRINT status.

This ensures that M600 makes the display show a continue button every time. Before, it was only behaving correctly for the first instance of M600.

Marlin/Marlin_main.cpp

@@ -10992,12 +10992,6 @@ inline void gcode_M502() {
    *  Default values are used for omitted arguments.
    */
   inline void gcode_M600() {
-    #ifdef SDSUPPORT
-        if ((AnycubicTFT.TFTstate==ANYCUBIC_TFT_STATE_SDPRINT)){
-        AnycubicTFT.TFTstate=ANYCUBIC_TFT_STATE_SDPAUSE_REQ;
-        AnycubicTFT.PausedByFilamentChange=true;
-        }
-    #endif
     point_t park_point = NOZZLE_PARK_POINT;
 
     if (get_target_extruder_from_command(600)) return;
@@ -11060,6 +11054,19 @@ inline void gcode_M502() {
     const bool job_running = print_job_timer.isRunning();
 
     if (pause_print(retract, park_point, unload_length, true)) {
+      #ifdef SDSUPPORT
+        #ifdef ANYCUBIC_TFT_DEBUG
+            SERIAL_ECHOLNPGM("DEBUG: Enter TFTstate routine");
+        #endif
+        AnycubicTFT.TFTstate=ANYCUBIC_TFT_STATE_SDPAUSE_REQ; // enter correct display state to show resume button
+        #ifdef ANYCUBIC_TFT_DEBUG
+            SERIAL_ECHOLNPGM("DEBUG: Set TFTState to SDPAUSE_REQ");
+        #endif
+        AnycubicTFT.PausedByFilamentChange=true; // set flag to ensure correct resume routine gets executed
+        #ifdef ANYCUBIC_TFT_DEBUG
+            SERIAL_ECHOLNPGM("DEBUG: Set filament change flag");
+        #endif
+      #endif
       wait_for_filament_reload(beep_count);
       resume_print(slow_load_length, fast_load_length, ADVANCED_PAUSE_PURGE_LENGTH, beep_count);
     }

Marlin/Version.h

@@ -41,7 +41,7 @@
    * Defines the version of the Marlin-AI3M build. Not to be confused with
    * Marlin's own build number, e.g. 1.1.9.
    */
-  #define CUSTOM_BUILD_VERSION "v1.4.0"
+  #define CUSTOM_BUILD_VERSION "v1.4.1"
 
   /**
    * Verbose version identifier which should contain a reference to the location