[Bug] GroupingNode Size Continuously Increases with FullName Size Binding

[ProjetNice]

Describe the bug
I found that when the ActualSize binding of GroupingNode is bound to FullName which is a Size, it causes its size to continuously increase. However, after changing the name, the size does not change anymore.

To Reproduce

1. Bind the ActualSize property of GroupingNode to a FullName property which is of type Size.
2. Observe the size of the GroupingNode.
3. Notice that the size of the GroupingNode continuously increases.
4. Change the name of the property or the GroupingNode.
5. Observe that the size no longer changes.

Expected behavior
The size of the GroupingNode should remain stable and not increase continuously, regardless of the name used.

Screenshots
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Does it happen in WPF version?
I have tried to reproduce the bug in the WPF version and [describe the result here].

Additional context
[Add any other context about the problem here. For example, any specific conditions under which the bug occurs, or any workarounds you have found.]