Reproduction steps:
1. Open the “ReproProject“ project
2. Open the Tile Palette window (Window > 2D > Tile Palette)
3. Left click anywhere within the blank preview section in the Tile Palette window
4. Observe the Console window
Expected result: No errors are thrown in the Console window
Actual result: “NullReferenceException: Object reference not set to an instance of an object” error is thrown in the Console window
Reproducible with: 6000.0.3f1, 6000.0.4f1
Not reproducible with: 2021.3.38f1, 2022.3.30f1, 6000.0.2f1
Reproducible on: Windows 11 Pro (22H2)
Not reproducible on: No other environment tested
Note: Also reproduces with right click