Steps to reproduce:

1. Open the attached project
2. Select "Lit_New Shader Graph" Material in the Assets folder
3. In the Inspector window, click the Select button for the Mask Map

Actual results: "FocusController has unprocessed focus events. Clearing." warnings are thrown after opening the selection window

Expected results: No warnings or errors are thrown after opening the selection window

Reproducible with versions: 6000.3.0a2, 6000.3.0a5

Not reproducible with versions: 6000.0.56f1, 6000.1.16f1, 6000.2.1f1 6000.3.0a1

Reproducible with (OS): Ubuntu 24.04

Not reproducible with (OS): macOS 15.6

Notes:

• If the issue does not occur right away, try repeating step 3 for different texture maps of the Material

Full Warning texts:

• FocusController has unprocessed focus events. Clearing.

UnityEngine.GUIUtility:ProcessEvent (int,intptr,bool&) (at /home/bokken/build/output/unity/unity/Modules/IMGUI/GUIUtility.cs:224)

• FocusController has unprocessed focus events. Clearing.

UnityEditor.RetainedMode:UpdateSchedulers () (at /home/bokken/build/output/unity/unity/Modules/UIElementsEditor/RetainedMode.cs:46)