Active Brush changes to the last selected Brush Pick when the Brush Pick filter is toggled on and off

How to reproduce:

1. Open the attached “IN-152759” project
2. Open the “SampleScene” scene
3. In the Hierarchy, select the “Grid” GameObject
4. In the bottom-right corner of the Scene view, expand the “Open Tile Palette” overlay and click the “Open Tile Palette” button
5. In the opened “Tile Palette” window next to the “Tilemap” picker dropdown, click the button with the color picker icon
6. In the “Tile Palette” window, select the “Default Brush” in the dropdown
7. In the “Tile Palette Brush Pick” overlay next to the search field, click the button with a save icon to add new brush
8. In the “Tile Palette” window, select the “Line Brush” in the dropdown
9. In the “Tile Palette Brush Pick” overlay next to the search field, click the button with a save icon to add new Brush Pick
10. In the “Tile Palette Brush Pick” overlay, select the “Line Brush” option
11. In the “Tile Palette” window, click on the “Line Brush” dropdown and select “Default Brush” option
12. Next to the “Tilemap” picker dropdown, click the button with the color picker icon
13. In the “Tile Palette Brush Pick” overlay next to the search field, click the “Filters Picks by Active Brush Type” button twice
14. Observe the result in the brushes dropdown in the “Tile Palette” window

Actual result: The active brush changes back to “Line Brush” (the last selected brush pick)
Expected result: The active brush stays “Default Brush” and only changes when a different brush is selected in the “Tile Palette Brush Pick”

Reproducible with: 6000.6.0a5, 6000.6.1f1, 6000.7.0a6
Not reproducible with: 6000.0.1f1, 6000.0.83f1, 6000.3.23f1, 6000.6.0a4

Reproducible on: Windows 11 Enterprise (25H2)
Not reproducible on: No other environments tested