Setting [Export] Array<Node3D> from GLTFextension not being serialized

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1

Godot Version

v4.4.stable.mono

Question

I’ve been writing a GltfDocumentExtension to change how things are imported. My issue is that trying to modify a exported array doesn’t appear to work.
When calling Array.Add() the array does resize but new entries aren’t saved.
Here is the node class I am using for this example:

[GlobalClass]
public partial class RoomWallRoot : Node3D
{
    [Export] public Array<Node3D> ChildWalls = new();
    
    /// <summary>
    /// The child nodes (wall meshes) are hidden based on the dot product between the player camera and the normal set here
    /// </summary>
    [Export] public Vector3 WallRootNormal;
}

And here is the relevant line from the GltfDocumentExtension.

    public override Error _ImportPost(GltfState state, Node root)
    {
        root.GetNodesOfTypeRecursively(out List<RoomWallRoot> roomWallRoots);
        foreach (var roomWallRoot in roomWallRoots)
        {
            foreach (var child in roomWallRoot.GetChildren())
            {
                if (child is not Node3D node3D) { continue; }

                node3D.Owner = root;
                // Appears to work correctly
                roomWallRoot.ChildWalls.Add(node3D);
            }
            
            foreach (var wall in roomWallRoot.ChildWalls)
            {
                // Appears to work here but doesn't actually serialize
                GD.Print(wall == null ? "NULL" : wall);
            }
        }
    
        return Error.Ok;
    }

The WallRootNormal variable I can edit just fine and it serializes too. I do this in _ImportNode(). I tried setting the Array inside the _ImportNode() function but the issue was the same.

I can work around this by simply getting the children of the RoomWallRoot node in its ready function. But I am just wondering if there is a bug here with serializing array or something?

2

I tried godot for the first time today, and I’m doing a similar setup in GDScript where I identify all the walls in a room on import.

I am getting the exact same error, where the array is resized but the node references are lost. This is annoying, I was hoping to not have to scan the whole scene tree at runtime.