Background Loading Stalls/Stuck

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Godot Version

Godot 4.4

Question

After updating my game from 4.3 to 4.4, LoadThreadRequest occassionally stalls while trying to load a large scene. I’ve had it get stuck at 50%, 83%, etc…

However, it occasionally just works, which makes this whole situation a lot more complicated to debug. This doesn’t seem to happen on small simple scenes.

Has this happened to anybody else after updating to 4.4 and does anybody know a fix?

This is my code if needed:

private void StartLoad(bool syncLoad)
{
	if(syncLoad)
	{
		waitingForSyncLoad = true;
		announcedSuccessfulLoad = false;
		syncLoadConfirmation = 0;
	}

	Error state = ResourceLoader.LoadThreadedRequest(incomingScenePath, "", useSubThread);
	
	if(state == Error.Ok)
	{
		loadingScreen.SetLoadingScreenStatus(true);
		GD.Print("=====================================================================");
		GD.Print("Attempting to load the following scene: " + incomingScenePath);
		GD.Print("=====================================================================");
		SetProcess(true);
	}
}

public override void _Process(double delta)
{
	ResourceLoader.ThreadLoadStatus status = ResourceLoader.LoadThreadedGetStatus(incomingScenePath, progress);
	if((int) status == 0 || (int) status == 2) // Load Fail.
	{
		GD.Print("=====================================================================");
		GD.Print("ERROR: Failed to load the following scene: " + incomingScenePath);
		GD.Print(status);
		GD.Print("=====================================================================");
		loadingScreen.SetLoadingScreenStatus(false);
		SetProcess(false);
		return;
	}
	else if((int) status == 1) // Loading...
	{
		GD.Print("LOADING: " + (float) progress[0] * 100f + "%");
	}
	else if((int) status == 3) // Load Success!
	{
		if(waitingForSyncLoad)
		{
			if(!announcedSuccessfulLoad)
			{
				Rpc("LoadConfirmation");
				announcedSuccessfulLoad = true;
				syncLoadConfirmation++;
				GD.Print("Load was succesful!");
				GD.Print("Waiting for all players to load...");
			}
			else
			{
				if(MultiplayerManager.instance.GetClientLobby().Count <= syncLoadConfirmation)
				{
					GD.Print("=====================================================================");
					GD.Print("Switching to the following scene: " + incomingScenePath);
					GD.Print("=====================================================================");
					PackedScene scene = (PackedScene)ResourceLoader.LoadThreadedGet(incomingScenePath);
					GetTree().ChangeSceneToPacked(scene);
					loadingScreen.SetLoadingScreenStatus(false);
					SetProcess(false);
				}
			}
		}
		else
		{
			GD.Print("=====================================================================");
			GD.Print("Switching to the following scene: " + incomingScenePath);
			GD.Print("=====================================================================");
			PackedScene scene = (PackedScene)ResourceLoader.LoadThreadedGet(incomingScenePath);
			GetTree().ChangeSceneToPacked(scene);
			loadingScreen.SetLoadingScreenStatus(false);
			SetProcess(false);
		}
	}
}

[Rpc(MultiplayerApi.RpcMode.AnyPeer, TransferMode = MultiplayerPeer.TransferModeEnum.Reliable)]
private void LoadConfirmation()
{
	syncLoadConfirmation++;
}