iOS 14: daily automation not running
I believe this is a feature. Depending on what automation you do, you may need to have it run in the HomeKit controller so it triggers from a device that is running and cleared for background tasks.
You can certainly report it to Apple as a bug, but everything I see from power management, automations are designed to be user triggered or relevant to the device in a near term sleep state, not that it wakes itself up and runs work in the background.
I would expect it to run once you wake the device after 6 am, though. That would be worth a bug if the task never triggers.
I’ve had an automation run each day for a week, so I’m not so sure this is a bug at all in iOS 14.