TreeItems' LeftPointer and RightPointer are not evaluated

[ahfakt]

Based on this issue I assume VSCode C/C++ extension uses this implementation. I tried to define a simple TreeItems. When debugging on Linux with GDB, even though natvis.xsd says so, LeftPointer and RightPointer is not evaluated. And I think the problem is the implementation of the GetTraverse function. It's also used by LinkedListItems's NextPointer, I haven't tried it but it may affect that too.

Example C++ code

template <typename T>
struct Tree {
	struct Node {
		Node* left = nullptr;
		Node* right = nullptr;
		T val;
	} n1, n2, n3;
	Node* head;
	int size = 3;
};

int main()
{

	Tree<int> tree;
	tree.n1.val = 11;
	tree.n2.val = 22;
	tree.n3.val = 33;
	tree.head = &tree.n2;
	tree.n2.left = &tree.n1;
	tree.n2.right = &tree.n3;

	return 0;
}

.natvis definition

<?xml version="1.0" encoding="utf-8"?>
<AutoVisualizer xmlns="http://schemas.microsoft.com/vstudio/debugger/natvis/2010">
	<Type Name="Tree&lt;*&gt;">
		<DisplayString>{size}</DisplayString>
		<Expand HideRawView="1">
			<TreeItems>
 				<!-- "size+0" OK-->
				<Size>size</Size>

 				<!-- "head+0" OK-->
				<HeadPointer>head</HeadPointer>

 				<!-- "left+0" ERR-->
				<LeftPointer>left</LeftPointer>

 				<!-- "right+0" ERR-->
				<RightPointer>right</RightPointer>

 				<!-- "*($T1*)(&amp;val+0)" OK-->
				<ValueNode>val</ValueNode>
			</TreeItems>
		</Expand>
	</Type>
</AutoVisualizer>

and related launch configuration

	"launch": {
		"version": "0.2.0",
		"configurations": [
			{
				"name": "Launch",
				"type": "cppdbg",
				"MIMode": "gdb",
				"request": "launch",
				"cwd": "${command:cmake.launchTargetDirectory}",
				"program": "${command:cmake.launchTargetPath}",
				"args": [],
				"externalConsole": false,
				"stopAtEntry": true,
				"visualizerFile": [
					"${workspaceFolder}/.natvis"
				],
				"showDisplayString": true
			}
		]
	}