What is facebook messenger last active disappeared 2021?

As an AI language model, I don't have access to the latest updates or news about Facebook messenger or its features. However, last active disappeared refers to the feature that shows the last time a user was active on Facebook messenger. Some users have reported that this feature disappeared in 2021, but it is unclear if it's a temporary glitch or a permanent change in the app's settings. This feature allows you to know if the person you are messaging is currently online or not. Without the last active feature, it can be harder to determine when a message was last seen or when someone is available for a chat.