In MinecraftServer API, setOp() will cause host can't use /setmaxplayer anymore

It banned me to use /setmaxplayer in a localword
Code:

import { world } from "@minecraft/server"

world.getPlayers()[0].setOp(false)
world.getPlayers()[0].setOp(true)

after that, /setmaxplayers can't be used, and also after restart. Still don't recovered