Player Icon is not created when built for Mac OSX Standalone

Steps to Reproduce:
1. Create a New Project
2. Click on Edit > Settings > Player
3. Assign a Sprite as an Icon
4. Build the Project

Actual Result:
Default Icon is created for the newly made Build

Expected Result:
Sprite that is assigned as Player Icon should be created.

Environment: Occurs on Mac OSX

Working fine on: 2018.3.0a1, 2018.2.0f2

Occurs with: 2018.3.0b2, 2018.3.0b1, 2018.3.0a5, 2018.3.0a2

Note:
Open PackageContents by Right click on the newBuild
Click on Contents> Resources
Observe that "PlayerIcon.icns" file is missing.