title: Little problem with slash commands (discord.js v13)
body: <p>Slash commands work well, no hassle, set with simple code: <code>bot.commands.set(command.name, command)</code><br />
  But I noticed that they are set only when the bot is running and it is added to the Discord server. If the bot is already on the Discord server, and a new command appeared later, then command does not appear in the list. I fix this by a second invitation, but commands in the list start to double, as if they were cloning yourself. Can this be fixable?</p>