Same problem. I've tried multiple exits and I'm sealed in.
ArgumentException: An element with the same key already exists in the dictionary.
at System.Collections.Generic.Dictionary`2[System.Guid,ObjectPersistencePacket].Add (Guid key, .ObjectPersistencePacket value) [0x00000] in <filename unknown>:0
at PersistenceManager.SaveObject (.Persistence persistence) [0x00000] in <filename unknown>:0
at PersistenceManager.SaveGame () [0x00000] in <filename unknown>:0
at GameResources.BuildSaveFile (System.String name) [0x00000] in <filename unknown>:0
at GameResources.SaveGame (System.String filename) [0x00000] in <filename unknown>:0
at GameState.Autosave () [0x00000] in <filename unknown>:0
at GameState.FinalizeLevelLoad () [0x00000] in <filename unknown>:0
at LevelStartWrapperExit.Update () [0x00000] in <filename unknown>:0
(Filename: Line: -1)
Tier2Backer cannot be loaded because the asset bundle type is not supported!
(Filename: C:/BuildAgent/work/d63dfc6385190b60/artifacts/StandalonePlayerGenerated/UnityEngineDebug.cpp Line: 49)