Guest user is suddenly visible even though not enabled
Since yesterday's update to Big Sur 11.2, a guest account has suddenly appeared on my login screen. I've checked Users & Groups and confirmed that Guest User is turned off. I also disabled Find My Mac on iCloud. The Guest User is still there and I'm not sure why this is happening as I've never once enabled Guest User.
How do I get rid of it?
iMac 27″, macOS 11.2