HelpMe Uh oh...of course I couldn't help myself and revoked a few of them. Fingers crossed.
It's been 20 hours since your post. Are you able to remember which permissions of which system apps you revoked? That is important, because issues caused by the lack of permissions for one or more system apps is likely to cause future instability to the GrapheneOS system that is running on your device. If you experience cryptic issues, you would do yourself a favour by having made a note of the revoked permissions beforehand, so that you can easily see which permissions to enable again in order to check whether the cryptic issue gets resolved or not.
By all means, do anything you want with your device. It's yours. But in the future, if you make a new thread in this forum asking for advice with resolving an issue, I kindly ask you to start the thread by saying that you have revoked permissions for system apps (and preferably what you revoked). That will save the people who are helping you out – and yourself! – a lot of time in determining the possible cause of your issue.