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In order for community members to help, we'd need some more information.
First, how do you make your phone display this error? You mentioned a permission page. I'm not sure which one you're talking about. I tried the following page, but no errors popped up: Settings > Privacy > Permission manager
What happens if you restart your phone and try to trigger another crash? Does it happen immediately, or does it take a few tries to get it to crash?
When the Settings app crashes, is it always the same activity? (Look at the first line of the second section where it says activity: com.android.permissioncontroller/.permission.ui.ManagePermissionsActivity
in your OP.)
What version of GrapheneOS do you have on your phone? Settings > About Phone > Build number
.
If you create a brand new test user profile, do you get the same crashes while using that other user profile?