Lock submitted simulation answers

scripts/ui/question_player.gd

@@ -1163,19 +1163,22 @@ func on_hide() -> void:
 		slot_machine_panel.close_panel()
 
 
-func _save_simulation_current_response() -> void:
+func _save_simulation_current_response(is_submitted := false) -> void:
 	if BlockSessionService.session_kind != "simulation":
 		return
+	if bool(current_answer.get("is_submitted", false)) and not is_submitted:
+		return
 	var question := BlockSessionService.get_current_question()
 	if question.is_empty():
 		return
-	current_answer = BlockSessionService.answer_current(selected_choice, eliminated, flagged)
+	current_answer = BlockSessionService.answer_current(selected_choice, eliminated, flagged, is_submitted)
 	ExamSimulationService.save_response(
 		str(question.get("id", "")),
 		selected_choice,
 		eliminated,
 		flagged,
-		int(BlockSessionService.get_current_elapsed_seconds()))
+		int(BlockSessionService.get_current_elapsed_seconds()),
+		is_submitted)
 
 
 func _on_simulation_state_changed() -> void:
@@ -1577,7 +1580,7 @@ func _toggle_eliminate_selected() -> void:
 
 func _submit_or_next() -> void:
 	if BlockSessionService.session_kind == "simulation":
-		_save_simulation_current_response()
+		_save_simulation_current_response(not selected_choice.is_empty())
 		if BlockSessionService.current_index + 1 < BlockSessionService.active_questions.size():
 			BlockSessionService.move_next()
 			_load_question()
@@ -3373,7 +3376,9 @@ func _apply_saved_choice_state() -> void:
 
 
 func _is_correct_answer_locked() -> bool:
-	return bool(current_answer.get("is_correct", false))
+	return bool(current_answer.get("is_correct", false)) or (
+		BlockSessionService.session_kind == "simulation" and
+		bool(current_answer.get("is_submitted", false)))
 
 
 func _refresh_submit_state() -> void: