How to reproduce:
1. Open user-submitted project (MacOSEditorAndNativeWindow.zip)
2. Open the 'Scene.unityscene'
3. Enter Play Mode
4. [Optional: If your receive “NativeWindow.bundle” cannot be opened error, run ‘xattr -cr’ on the project directory]
5. Click the button in the Game View
6. In the window that pops up enter some text
7. Attempt to select it by using CMD+A, copy and paste it

Expected result: Edit commands are functioning, text can be selected, copied, pasted
Actual result: Edit commands do not work

Reproducible with: 2019.3.0b11, 2019.4.11f1, 2020.1.0a11, 2020.1.6f1, 2020.2.0b3
Not reproducible with: 2018.4.27f1, 2019.3.0b10, 2020.1.0a1, 2020.1.0a9

Notes:
Same issue can be observed in any project by selecting File > Build and attempting to select all, copy or paste in the build title pop-up window