PUN & SteamVR_LoadLevel

Descriptions:
PhotonNetwork.LoadLevel(int levelNumber)/(string levelName):

 Called by user scripts to load/sync scene in Unity
 Used to stop the messaging queue and sync scenes between players

NetworkingPeer.SetLevelInPropsIfSynced(int levelNumber)/(string levelName):

 Called by PhotonNetwork.LoadLevel(...)
 Used to set/update the RoomCustomProperty NetworkingPeer.CurrentSceneProperty ("curScn")
 "curScn": The string synced between players holding the current scene name

NetworkingPeer.LoadLevelIfSynced():

 Called by both OnJoinedRoom() & ReadoutProperties(...)
 Used to sync the scene when joining the room or "curScn" changed (by MasterClient)
 Also calls PhotonNetwork.LoadLevel(int levelNumber)/(string levelName) to load the new scene for the other clients

To use SteamVR_LoadLevel update PhotonNetwork.LoadLevel(int levelNumber)/(string levelName) to use the SteamVR_LoadLevel.Begin(int levelNumber)/(string levelName). (in my game I use the "Scripting Define Symbols" "VIVE" to denote this build is for use with the Vive.)

#if VIVE
	SteamVR_LoadLevel.Begin(int levelNumber)/(string levelName);
#else
	SceneManager.LoadScene(int levelNumber)/(string levelName);
#endif

NOTE SteamVR_LoadLevel.Begin(int levelNumber) does not exist yet, but you can follow these instructions on how to add it: https://steamcommunity.com/app/358720/discussions/0/333656722980764718/