How to reproduce:
1. Create a new Unity project
2. In the Scene view, switch to the Flythrough mode (Middle mouse button)
3. While in the Flythrough mode, press "Shift+Space" to maximise the Scene view
4. Without clicking anything, press the "Shift+Space" again and observe the results
Expected results: The Scene view in minimised
Actual results: The Scene view can't be minimised unless something is clicked
Reproducible with: 6000.3.0a3, 6000.3.9f1, 6000.4.0b9, 6000.5.0a7
Not reproducible with: 6000.0.68f1, 6000.3.0a2
Reproducible on: macOS Tahoe 26 (M1)
Not reproducible on: No other environment tested
Note: For the reproduction, it is crucial to keep holding the Middle mouse button or release it only after maximising the Scene view