It appears that our MySQL server is failing to start due to an invalid downgrade attempt. Specifically, the server is trying to downgrade from MySQL version 9.x.x to 8.4.2, which is causing repeated failures during the initialization phase. The logs indicate errors related to an "Invalid MySQL server downgrade" and issues with the InnoDB storage engine, including a failure to open 'mysql.ibd' files and initialize the Data Dictionary.

I've attempted to restart the server multiple times, but the issue persists, and the server shuts down immediately after encountering these errors.

[ERROR] [MY-014061] [InnoDB] Invalid MySQL server downgrade: Cannot downgrade from 90001 to 80402. Downgrade is only permitted between patch releases.