Clients randomly fail to seamless travel
We're running into a bizarre bug(?) where sometimes clients fail to seamless travel and just appear to hang while in the transition map (black screen). We have no idea why this is happening, or what could even be causing it. It's impossible to reproduce with just one client connecting to a listen server but can easily be reproduced once we start adding more players to the test. Client-side logs don't appear to show anything different between a successful travel and an unsuccessful travel.
Our travel flow between maps is as follows:
The 'sticking' is most noticeable between the lobby and the game map (between 1 and 2) but I think it may actually happen sometimes between 2 and 3 which is less noticeable because:
We're on source compiled 4.16.3 using OnlineSubsystemSteam. Testing in packaged development build.
Server-travel is such a self contained function we don't really know how to even troubleshoot this issue (like how could we have broken it) so I'm wondering if someone can help even just suggesting an area of investigation or literally anything we could try.
edit: another note - I'm sure if this was a problem with the engine others would have reported it so I'm pretty certain we'll have just don't something wrong. What that may be, however, I have no idea.
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