/code. Copy the password in chat, follow the link, and paste the password.
/resourcepack command.
/inventory: a way to force players to open inventory GUIs./playerlist: a way to display text on the player list./data on players: you can edit player data like Motion, health, abilities, etc./stopinstance <world-uuid> to close it, and then /safemode <world-uuid> to start the world with all datapacks and command blocks disabled to see if you can fix it. If it's still stuck,
make a ticket in #stuck-worlds on the Discord, and ping @Minecraft Mod.