Unclear: Start NetworkManager in Awake can have "undesirable results"

[CodeSmile-0000011110110111]

The DANGER box under NetworkManager here is missing information:

DANGER
Don't start a NetworkManager within a NetworkBehaviour's Awake method as this can lead to undesirable results depending upon your project's settings!

First: "undesirable results" sounds pretty harmless. This should at least hint at the possible issues.

Then it should also indicate what project settings might affect this. Are these NGO specific settings, or script execution order, or something else?