I can use commands like /ban, /kick, and /stop in singleplayer. It shows up in the autocomplete as well.
/ban works as in multiplayer.
/kick crashes the game, but it does not give me a crash log.
/stop works as in multiplayer.
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[media][media][media]

Yeah I just noticed this and came here to report it

Could this be for the open-to-LAN feature? 😛