I encountered the same issue after updating to BIOS 3.20 today. The fix I found was to set the /sys/power/mem_sleep default to s2idle:
> cat /sys/power/mem_sleep
[s2idle] deep
On my operating system NixOS, this is accomplished with the configuration.nix code:
boot.kernelParams = [ "mem_sleep_default=s2idle" ];
After applying this configuration, GNOME sleep works as normal again (aside from the fact that it’s no longer deep sleep).