Yeah this issue started happening for me as well when I updated to the latest beta. Based on what the first reply said, I went into Preferences > Stability and at the bottom of the list unchecked "Windows 11 CPU utilization measurement workaround" and the flashing CPU graphs stopped flickering. However, now my Sensor Panel is back to reporting the CPU utilization incorrectly as Task Manager will show 3-5% utilization while Sensor Panel is showing 0% whereas with the option enabled, they were showing the same percentage. Hopefully for the next stable release this bug will be fixed so we can have accurate CPU utilization and non-flickering CPU graphs.