I concur
@AppleLover87 but if you don't do anything your Mac is basically useless after this update (at least mine).
I thought about reverting back to 10.15.6 but I didn't have any Time Machine backup OR updating to the Big Sur Public Beta to see if things was different. Prior to discover those "fixes", I've questioned myself if it was a capacitor on the Mac not being able to save anymore the SMC settings (is it for real tho?) or even my SSD.
In the end, I've manually backed up all my files/folders (as I'm always used to do) and then I did a 10.15.7 installation from scratch (I had also prepared a USB with the latest installer). After the 2nd bootup after installation I had the exact same issue without any 3rd party apps installed, just my iCloud account logged in, so I figured it was something else and that "Keychain-related" thing was my best bet to try (should've done it BEFORE erasing my Mac...).