Since around 1:00 UTC, new guilds were not being cached by Fire, causing a number of issues with the biggest being the bot not working in new guilds until a restart.
This was due to me adding a listener for GUILD_CREATE on Fire's websocket manager without knowing it prevented the normal listener from running. This issue was not apparent when testing as I have no need to invite my dev bot to a new guild.
If you recently invited Fire and it appeared to not work, this would be why and has since been fixed.
I apologise for the inconvenience.