How to reproduce:
1. Create and open a new project
2. Change Editor to full screen, by clicking the green button in top left corner
3. Enter Play mode
4. Observe the Editor

Actual result: Editor moves up slightly leaving a black gap at the bottom of the screen
Expected result: Nothing changes, Editor screen stays put

Reproducible on: 2023.1.0a25, 6000.0.67f1, 6000.3.8f1, 6000.4.0b8, 6000.5.0a6
Not reproducible on: 2023.1.0a24

Reproducible with: macOS 26.2 (M1 Pro)
Not reproducible with: No other environment tested

Note: After leaving full screen the Editor will remain shifted and part of the UI will be obfuscated