macOS Monterey 12.3.1 includes bug fixes and security updates for your Mac.
This update fixes the following issues: ● Some 2021 MacBook Pro models cannot update or restore to macOS Monterey 12.3 ● USB-C or Thunderbolt external display does not turn on when connected to Mac mini (2018) as a second display ● Bluetooth devices, such as game controllers, may disconnect from your Mac after playing audio through some Beats headphones
You can install the update from Software Update in System Preferences.