A "File exists" error is thrown when creating a project on an external drive

How to reproduce:

1. Ensure that an external drive is connected
2. Create a new project in Unity Hub with the location set to the external drive
3. Observe the Editor Launch Screen

Actual result: A “Copying file failed” window pops up with a “File exists” error
Expected result: Project is created without error pop-ups

Reproducible with: 6000.0.5f1, 6000.0.83f1, 6000.3.23f1, 6000.5.10f1, 6000.6.0b10, 6000.7.0a5
Not reproducible with: 6000.0.4f1

Reproducible on: macOS 26.5.2 (M4 Max)
Not reproducible on: No other environments tested

Notes:

• User reports experiencing a crash following this, which was not reproduced by CQA
• The pop-up gives the following options: “Try Again”, “Force Quit” and “Cancel”
• Selecting “Cancel” on several pop-ups in a row creates the project successfully