Reproduction steps:
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1) Open user's project "MultiPlayerTest"
2) Build scene "Scene" for standalone
3) Run the same scene as a host in editor
4) Run the standalone build and connect as client
--- You will see 2 cubes (they can be moved around with the arrow keys)
5) Disconnect the client and connect again
--- The server will spawn the player cube, but the client never gets any data

Regression introduced in 5.3.5p4