How to reproduce:

1. Open the "Tile Palette" project
2. Open the "Sample Scene"
3. Select the "Grid/Tilemap"
4. Focus on the Scene view
5. Press the "Open Tile Palette" in the Scene view overlay
6. In the Tile Palette window, press "Create new Tile Palette" -> "Create new Tile Palette"
7. Press Create, and then Cancel in the "Create palette into folder"
8. Observe the Editor

Expected result: No warning dialog box is shown
Actual result: A "You cannot save to an invalid folder" warning dialog box is shown

Reproducible in: 6000.0.62f1, 6000.1.0a2, 6000.2.11f1, 6000.3.0b9, 6000.4.0a4
Not reproducible in: 6000.1.0a1

Reproduced on: Windows 11 Pro (24H2)
Not reproduced on: No other environment tested

Note: Sometimes, even when pressing any button on the dialog box to close it, the dialog box loses focus and moves behind the Tile Palette window