The 6.6.7 kernel release fixed an apparent regression in previous kernel versions, that caused issues with WiFi for many users. This was mentioned in the Stable Update 2023-12-10 announcement Broken Wifi with 6.1.66 and 6.6.5 kernels.
If you are using WiFi, choosing the 6.6.7 kernel is likely the reason for this magical transformation. Are you using WiFi? 
