A bug I've found with this build is with the Screensavers.. Apple's NEW Screensavers work just fine, but any Screensavers I've had installed and that have been working fine thru macOS 14 beta 1, are now NOT working at all. I found that my M1 MBP was warming up my lap more than normal, and checked Activity Monitor to see that there were four listings for "Legacy" Screensavers. Once those were Force Quit, and only using one of the New Screensavers instead of one of the ones I'd like to use, all is well.
I filed FB12416878 for this