List foldout header displays the next element's header instead of its own value after editing a foldout list field

Steps to reproduce:

1. Create and open a new project
2. Create a new Material and select it
3. Right-click the Inspector tab and enable "Debug"
4. Expand "Build Texture Stacks" list and add 10 fields (elements 0-9) (make sure the foldouts are collapsed)
5. Expand the first foldout (Element 0) and enter "a" into the "Group Name" field
6. Observe the header of the edited foldout

Actual results: The foldout header reads "Element 1"

Expected results: The foldout header reads "a"

Reproducible with versions: 6000.0.0f1, 6000.0.79f1, 6000.3.20f1, 6000.5.5f1, 6000.6.0b4, 6000.7.0a3

Tested on (OS): Windows 11 Pro (25H2)

Notes:

• If before step 5 any foldout in the list is expanded, collapse them delete all elements, and re-add them
• If there are no next foldout headers in the window, the header will switch to an empty string