Client cannot find LevelStreaming in editor mode

From licensee:

When we run MainMap (NM-Standalone) and then open GameMap to play (options - listen). When the client joins the server, it won't be able to find the LevelStreaming in GameMap (see - image01).

However, if we directly run GameMap (NM-ListenServer), the client can find the correct LevelStreaming, even if we previously used (NM-Standalone), it can still find the correct LevelStreaming (see - image02).

The issue happens in PIE with "Run Under One Process" enabled.

[UE-23848] Bug Status

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