bugfix to prevent studysetup.json from being accidently overwritten

Source/StudyFrameworkPlugin/Private/SFStudySetup.cpp

@@ -101,10 +101,16 @@ void ASFStudySetup::PreSave(const ITargetPlatform* TargetPlatform)
 #if WITH_EDITOR
 void ASFStudySetup::PostEditChangeProperty(FPropertyChangedEvent& MovieSceneBlends)
 {
+	// PostEditChangeProperty() is called twice when actor is drag-'n'-dropped into level because:
+	// First a preview actor with transient values is created when dragging out of list
+	// Then the final actor is created once dropped into map.
+	// We only want to execute the code for the latter actor -> Workaround:
+	if (!HasAllFlags(RF_Transient)) {
 		//Re-enabled to avoid accidental data loss
 		SaveToJson();
 		Super::PostEditChangeProperty(MovieSceneBlends);
 	}
+}
 #endif
 
 USFStudyPhase* ASFStudySetup::AddStudyPhase(FString InPhaseName)