TreeView Virtualisation broken in .Net 8
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- C#
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Description
### Description
The Issue decribed in #7321 seems to persist in .Net 8
### Reproduction Steps
1. Using Treeview with Virtualisation false -> All items get rendered but of course slow
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3. Using Treeview with Virtualisation true -> nested items seem to get created but not rendered correctly

### Expected behavior
The TreeViewItems should be all rendered
### Actual behavior
The TreeViewItems are not all rendered
### Regression?
_No response_
### Known Workarounds
_No response_
### Impact
_No response_
### Configuration
_No response_
### Other information
_No response_
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