How to reproduce:
1. Open the user's attached "UIMultiTreeView" project
2. Select the "test 1" Texture 2D asset in the Project Browser
3. Toggle on the foldouts and change the column width in the Inspector
4. Unselect the asset
5. Re-select the asset
Expected result: Changes done in the asset remain when unselecting it
Actual result: All the changes done in the asset are reverted to the default state. For instance, foldouts got toggled off, and column width got changed back to the default one
Reproducible with: 2022.1.0b13, 2022.2.0a8
Couldn't test with: 2019.4.37f1, 2020.3.32f1, 2021.2.17f1 (user scripts aren't compatible and missing class errors are thrown)