Two previews are visible at once and overlap when reducing the expanded preview size in Object Selector windows

Steps to reproduce:

1. Create a new 3D URP proejct
2. In the Hierarchy, select any GameObject
3. In the Inspector, click on the cube icon to modify the GameObject's icon
4. Select "Other..."
5. In the opened window select any texture
6. Resize the texture preview from the highest size to smaller
7. Observe the behavior

Actual results: The previously expanded preview and the resized preview are visible at the same time for a brief moment during the transition

Expected results: Only one preview should be visible during the resize transition, with no overlap between preview states

Reproducible with versions: 6000.5.0b8, 6000.6.0a5

Can’t test with versions: 6000.3.15f1, 6000.4.6f1, 6000.6.0a3 (preview would not expand to such bigger size)

Tested on (OS): Ubuntu 24.04, macOS 26.4

Notes:

• Reproduces with all object pickers in the Editor
• On macOS and Windows it seems more like a timing issue, and changing the preview size fast reproduces the issue