Core/Instance: Reset FAIL to NOT_STARTED on load

src/server/game/Instances/InstanceScript.cpp

@@ -398,7 +398,7 @@ void InstanceScript::ReadSaveDataBossStates(std::istringstream& data)
     {
         uint32 buff;
         data >> buff;
-        if (buff == IN_PROGRESS || buff == SPECIAL)
+        if (buff == IN_PROGRESS || buff == FAIL || buff == SPECIAL)
             buff = NOT_STARTED;
 
         if (buff < TO_BE_DECIDED)