I've been looking at this, and while I can't reproduce this I've found a weird thing where if a client gets killed while they're loading in (the player model actually spawns in the world before the client actually finishes loading, it's a small window but it's there and can be killed before the client is done loading), and THEN the client is disconnected/gets kicked or whatever while still in that load screen, the game hangs on load until that client is kicked again and relogs.
From what I gather, you may have died while you were logging in by rare chance?
Either way, although I can't reproduce this, I did find another oddity related to it... so perhaps a fix for that would fix this also. May have been one weird combination of things that caused this in particular to happen. Thanks for reporting it and all the information... I'll put this in Work in Progress, since I can't confirm this bug but something similar. Feel free to add to this ticket though in a comment if you think of something/see this again or anything.
By the way, the server you're connected to doesn't have the proper ports forwarded, evident by you failing to connect via litenetlib and falling back to steam networking