[SOLVED][PREFABS] UEFN Island no longer launches after 39.20 Update due to "-0" Transform Values on Prefabs

Summary

EDIT: Resolved. Leaving up for anyone else who may experience the same issue.

After the 39.20 update, my team’s Island no longer launches.

The game has an existing published version. This release launched and played without issue on 39.10.

When a player attempts to launch the Island they become stuck trying to matchmake/download, eventually receiving a Connection Timeout message:

LogNet: Error: UEngine::BroadcastNetworkFailure: FailureType = ConnectionTimeout, ErrorString = UNetConnection::Tick: Connection TIMED OUT. Closing connection..

The same account can load other islands with no issue.

However, there are no notable errors reported in UEFN or Fortnite logs that shed light on what is causing this. Logs indicate that the following is occurring without issue:

  • Verse compilation
  • Project Cook
  • Session Launch

New Private Versions can publish without issue.

This occurs in all versions of the project - the following were tested:

  • Published Island
  • Private Playtest Code
  • Private Build
  • Launched from Editor

In all instances, the connection then times out with no logged information as to why.

Has anyone experienced anything similar to this after an update? Are there any steps that can be taken to resolve (or further debug) this issue?

Please select what you are reporting on:

Unreal Editor for Fortnite

What Type of Bug are you experiencing?

Stability

Steps to Reproduce

  1. Attempt to launch Island

Expected Result

Island launches

Observed Result

Player matchmakes between 30 seconds and 2 minutes, then times out.

Platform(s)

All.

UPDATE: This issue has been resolved by the team. The specific issue was:

  • Some prefabs had transform values set to “-0“, as opposed to “0“

This appears to have been disallowed with the Prefab Editor changes implemented for 39.20. Setting these to 0 resolved the issue.

Thank you!