Savestates: Fix optional_savestate_state use

rpcs3/Emu/Cell/PPUThread.cpp

@@ -2364,10 +2364,15 @@ void ppu_thread::serialize_common(utils::serial& ar)
 
 	ar(optional_savestate_state, vr);
 
+	if (!ar.is_writing())
+	{
 		if (optional_savestate_state->data.empty())
 		{
 			optional_savestate_state->clear();
 		}
+
+		optional_savestate_state->set_reading_state();
+	}
 }
 
 ppu_thread::ppu_thread(utils::serial& ar)

rpcs3/Emu/IdManager.cpp

@@ -12,12 +12,16 @@ namespace id_manager
 template <>
 bool serialize<std::shared_ptr<utils::serial>>(utils::serial& ar, std::shared_ptr<utils::serial>& o)
 {
-	if (!o || !ar.is_writing())
+	if (!o)
 	{
-		o.reset();
 		o = std::make_shared<utils::serial>();
 	}
 
+	if (!ar.is_writing())
+	{
+		o->set_reading_state();
+	}
+
 	ar(o->data);
 	return true;
 }