How to fix random disappearance of Calendar notifications on M1 iMac running macOS Sequoia?

I have an ongoing problem with Calendar Notifications randomly appearing, and dissapearing even though they should remain until dismissed. The problem is worse since getting a M1 iMac 2 years ago. I'm running Sequoia. I know it is a bug, is there any fix for it?

[Re-Titled by Moderator]

Original Title: M1 iMac