I have google play services installed in owner profile and logged in with a throwaway account.
Play services have unrestricted battery usage. Not I'm not receiving any notification for any apps if the phone is idle, so I did a complete factory reset still I'm not getting any notifications.
Been using graphneos for more than 4 years, everything was working fine before.
Apps not receiving notifications: Molly, signal, WhatsApp, WhatsApp business.

Any help is appreciated.

Delete and reinstall the Google services in the Whatsapp level. ( is current users messages on here?)
Later in the main level under GrapheneOS APP Info, check the notifications in the subcategory and adjust if necessary.