ShooterGame clients are unable to see LAN Off servers in the browser

Mac is unable to host Mac or Windows clients in ShooterGame .

The issue does not occur in:
4.14.3 - 3251583

Setup:
Have access to ShooterGame on both a Mac and a Windows.

Repro:

1. Launch ShooterGame on Mac with "open <path to UE4Editor.app> --args <path to ShooterGame.uproject> -Game"
2. Select Host on the Mac and launch the round
3. Launch ShooterGame on Windows with "UE4Editor.exe <path to ShooterGame.uproject> -Game"
4. Select Join on the Windows machine

Result: No servers will be found.

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