Edit session hangs and disconnects when Err() is called on round end

General Issues and Bug Reporting
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Summary

When Err() is called during round end, the edit session hangs and becomes unresponsive. After 30 seconds, the session disconnects due to a connection timeout.

Please select what you are reporting on:

Unreal Editor for Fortnite

What Type of Bug are you experiencing?

Verse

Steps to Reproduce

  1. RoundManager.SubscribeRoundEnded(OnRoundEnded) in any component
  2. Call Err(“Test”) in OnRoundEnded
  3. In edit session → Start Game → End Game

Expected Result

VerseRuntime: ErrorRequested: A runtime error was explicitly raised from user code. (User Message: ‘Test!’)

Observed Result

UNetConnection::Tick: Connection TIMED OUT. Closing connection.. Elapsed: 30.01 (…)

Platform(s)

PC

Additional Notes

It used to work properly before v42.00

2 
test_component := class<final_super>(component):

    OnSimulate<override>()<suspends>:void =
        RoundManager := Entity.GetFortRoundManager[] or Err("test_component.OnSimulate() — fort_round_manager is not valid")
        RoundManager.SubscribeRoundEnded(OnRoundEnded)

    OnRoundEnded():void =
        Err("Test!")