I have similar issues but different logs. I have a lot of files and with total of 7012 lines of code:
LogOutputDevice: Error: Ensure condition failed: !IsBunchTooLarge(Connection, Bunch) [File:D:\build++Fortnite\Sync\Engine\Source\Runtime\Engine\Private\DataChannel.cpp] [Line: 1161]
LogOutputDevice: Error: Attempted to send bunch exceeding max allowed size. BunchSize=299039, MaximumSize=262144 Channel: [UActorChannel] Actor: ValkyrieBeaconClient /Engine/Transient.World_0:PersistentLevel.ValkyrieBeaconClient_2, Role: 3, RemoteRole: 2 [UChannel] ChIndex: 3, Closing: 0 [UNetConnection] RemoteAddr: 18.156.237.216:15061, Name: IpConnection_2, Driver: IpNetDriver_2 IpNetDriver_2, IsServer: NO, PC: NULL, Owner: ValkyrieBeaconClient_2, UniqueId: MCP:843601e06dd8490ea3e6a97a60ab1efb