Signal SD completion later (#21840)

Marlin/src/gcode/sd/M1001.cpp

@@ -25,6 +25,7 @@
 #if ENABLED(SDSUPPORT)
 
 #include "../gcode.h"
+#include "../../module/planner.h"
 #include "../../module/printcounter.h"
 
 #if DISABLED(NO_SD_AUTOSTART)
@@ -64,6 +65,11 @@
  * M1001: Execute actions for SD print completion
  */
 void GcodeSuite::M1001() {
+  planner.synchronize();
+
+  // SD Printing is finished when the queue reaches M1001
+  card.flag.sdprinting = card.flag.sdprintdone = false;
+
   // If there's another auto#.g file to run...
   if (TERN(NO_SD_AUTOSTART, false, card.autofile_check())) return;