Monterey Calendar Application is NOT tracking current "Today" when left open
as of 10/23/2023 with Monterey 12.7 and Calendar 11.0 (2855.6.1)
The "Today" user interface button is dead... you do not see the current date information, but instead see the calendar entries for the date you opened the application on.
Restarting the calendar application brings up "Today" correctly.
Pressing the "Today" button should at least poll the system date, but it's probably depending on asynchronous tracking of the date that Monterey is not updating, but I'm clueless without open source to dive into.
I'll probably implement a crontab daily killall on my Calendar application to ensure I'll be looking at today's info.
MacBook Pro 13″, macOS 10.15