FusionLauncher: Failed to switch scenes: Fusion.AssertException

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I get this error after reimporting a prefab. I'm not changing anything, just reimporting it.

The prefab has the Network Object component on it.

The error occurs on both 1.0.0 (stable) and 1.1.0 (nightly; Build 458)

[Fusion] [NetworkSceneManager] FusionLauncher: Failed to switch scenes: Fusion.AssertException: Exception of type 'Fusion.AssertException' was thrown.
  at Fusion.Assert.Check (System.Boolean condition) [0x00009] in Fusion\Fusion.Common\Assert.cs:51 
  at Fusion.NetworkSceneManagerBase.FindNetworkObjects (UnityEngine.SceneManagement.Scene scene, System.Boolean disable, System.Boolean addVisibilityNodes) [0x0006c] in Assets\Photon\Fusion\Scripts\Prototyping\NetworkSceneManagerBase.cs:113 
  at Fusion.NetworkSceneManagerDefault+<SwitchSceneSinglePeer>d__5.MoveNext () [0x0012c] in Assets\Photon\Fusion\Scripts\Prototyping\NetworkSceneManagerDefault.cs:149 
  at Fusion.NetworkSceneManagerBase+<SwitchSceneWrapper>d__28.MoveNext () [0x000bb] in Assets\Photon\Fusion\Scripts\Prototyping\NetworkSceneManagerBase.cs:228 
UnityEngine.Debug:LogError (object,UnityEngine.Object)
Fusion.FusionUnityLogger:Log<Fusion.Log/DefaultContext> (Fusion.LogType,string,Fusion.Log/DefaultContext&,string) (at Assets/Photon/Fusion/Scripts/FusionUnityLogger.cs:123)
Fusion.Log:Error (object) (at Fusion/Fusion.Common/Log.T4.cs:229)
Fusion.NetworkSceneManagerBase:LogError (string) (at Assets/Fusion/Scripts/Prototyping/NetworkSceneManagerBase.cs:201)
Fusion.NetworkSceneManagerBase/<SwitchSceneWrapper>d

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