DisconnectByClientTimeout ONLY happening with standalone builds. Not editor!

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Hi all,
We're observing an easily reproducible issue where the master server gets disconnected upon another player joining the room. The funny thing is, this *only* happens with standalone builds. I can't repro this in editor. Is this because in editor, the disconnect logic is #if'd out? If this is the case, is there a way to enable it? I'm pretty sure we're just sending too much to new clients (we send a large, one time state transfer to new clients), but it would be good to debug this in-editor.

Thanks.