Bug UI Builder incorrect element name when copy-pasting

If you try to copy-paste an element with changed name (but not yet saved to disk) ui builder displays an old name in hierarchy until you save file to disk.

Repro:
1) Open any UXML in UI Builder.
2) Add any element to hierarchy [for example VisualElement]
3) Save UXML to disk (CTRL+S)
4) Rename added element [for example into my-visual-element]
5) Copy and paste it [for example under the same parent, basically just press CTRL+C, CTRL+V)
6) Observe 2 elements one of which has an old name, and one has a new name [in my example it would be VisualElement and my-visual-element]
7) Save UXML to disk (CTRL+S)
8) Observe both elements recieve correct name [in my example my-visual-element]

I'm using Unity 2023.2.0a15

 

CASE IN-41708