Reproduction steps:
1. Open the attached "MCListViewTest" project
2. Open the "Assets/Scenes/SampleScene" scene
3. Enter the Play mode
4. Open the Task Manager
5. Observe the Unity Editor memory usage
6. In the Game view, click on the left "Show / Hide" button 20 times
7. Observe the Unity Editor memory usage in the Task Manager
Expected Result: Memory usage has not increased
Actual Result: Memory usage has increased a lot
Reproducible with: 2022.3.28f1, 6000.0.1f1
Could not test with: 2021.3.38f1 (MultiColumnListView feature does not exist)
Reproducible on: Windows 11 Pro
Not reproducible on: No other environments tested