Discord(JS) bot not detecting presenceUpdate

Question

In Discord.js (v.12.4.1), anytime a user changes their presence (e.g. status, activity), presenceUpdate should be fired; however, the bot is not detecting any updates. I have tried changing status states, changing custom status, listening to Spotify or playing a game that has rich presence, but none of the above triggers the event. Other events such as bot.on('voiceStateUpdate', ...) has no problem. Is there anything wrong with this code? Thanks.

const bot = new Discord.Client();
bot.login(TOKEN);

...

bot.on('presenceUpdate', (oldP, newP) => {
  // do things, for example
  console.log(newP);
});