Some CRON Event Failures despite Site optimizations and code clean ups

Hi there.

We noted several PHP errors and decided to do a clean up for the custom code and DB (optimization). We are still see this error in our logs:

[16-Oct-2024 08:45:08 UTC] Cron reschedule event error for hook: action_scheduler_run_queue, Error code: could_not_set, Error message: The cron event list could not be saved., Data: {“schedule”:”every_minute”,”args”:[“WP Cron”],”interval”:60} [17-Oct-2024 01:07:22 UTC] Cron reschedule event error for hook: action_scheduler_run_queue, Error code: could_not_set, Error message: The cron event list could not be saved., Data: {“schedule”:”every_minute”,”args”:[“WP Cron”],”interval”:60} [17-Oct-2024 10:01:21 UTC] Cron reschedule event error for hook: action_scheduler_run_queue, Error code: could_not_set, Error message: The cron event list could not be saved., Data: {“schedule”:”every_minute”,”args”:[“WP Cron”],”interval”:60}

WP-CRON is also not showing any details as to why this is happening.

Here are the details of our set up:

WP Version: 6.6.2
WP Memory Limit: 4 GB

PHP Version: 8.1.29

WC Version: 9.3.3

Action Scheduler Version: ? 3.8.1

Is there a bug with a specific version that we should be aware of and how can we resolve it please and could this result in DB connection errors (error 500).

If you kindly point me in the right direction for troubleshooting this it would be greatly appreciated.