Default Icon for Mac Standalone appears distorted in explorer.

Steps to Repro:
1. Create a new project
2. Edit > Project Settings > Player > Default Icon > Select any image
3. File > Build Settings > Build and Run

Actual Result:
Default Icon for Mac Standalone is distorted.

Expected Result:
Default Icon is as per the selected image.

Reproducible on:
2019.3.0a2, 2019.2.0b1, 2019.2.0a8

Works fine on:
2019.2.0a7

Environment:
Only on MacOS