Steps to reproduce:

1. Create a new Unity project using a 3D Universal Template
2. Go to Edit > Project Settings > Player
3. Expand the "Icon" dropdown
4. Toggle the "Override for Windows, Mac, Linux" option
5. Click on the Texture2D object fields and select any square texture
6. Observe the Texture2D field
7. Untoggle and toggle back the "Override for Windows, Mac, Linux" option
8. Observe the window

Actual results: The Texture2D field is a rectangle and makes textures look stretched out, and the selected texture is not retained after disabling the property

Expected results: The Texture2D field should be a square (like in the "Default Icon" or "Default Cursor" fields and the texture should be retained after untoggling/toggling the property

Reproducible with versions: 2023.1.0b1, 6000.0.65f1, 6000.3.4f1, 6000.4.0b4, 6000.5.0a4

Tested on (OS): Windows 11

Notes:

• It seems counter intuitive that the field appears stretched out and is a rectangle, when the expected texture is a square (1024x1024, 512x512 and so on). The same field looks good in the "Default Icon" and "Default Cursor" fields
• Not sure if the texture should be retained after property is disabled; however, in the Splash Image > Logos settings, the textures are retained after disabling "Show Splash Screen" property