[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] Nsane457:
Ok. Reflashed without Magisk. Other than the "On-body detection" suggestion in settings, mentioned in the opengapps thread, the same problems persist. Also, I noticed selecting "Advanced" in the top-right drop-down menu in Privacy Guard crashes with the following in logcat:

09-20 02:34:02.600 913 3651 I ActivityTaskManager: START u0 {act=android.settings.APP_OPS_SETTINGS} from uid 1000
09-20 02:34:02.602 14452 14452 D AndroidRuntime: Shutting down VM
09-20 02:34:02.603 14452 14452 E AndroidRuntime: FATAL EXCEPTION: main
09-20 02:34:02.603 14452 14452 E AndroidRuntime: Process: org.lineageos.lineageparts, PID: 14452
09-20 02:34:02.603 14452 14452 E AndroidRuntime: android.content.ActivityNotFoundException: No Activity found to handle Intent { act=android.settings.APP_OPS_SETTINGS }
09-20 02:34:02.603 14452 14452 E AndroidRuntime: at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:2058)
09-20 02:34:02.603 14452 14452 E AndroidRuntime: at android.app.Instrumentation.execStartActivity(Instrumentation.java:1716)
09-20 02:34:02.603 14452 14452 E AndroidRuntime: at android.app.Activity.startActivityForResult(Activity.java:5192)
09-20 02:34:02.603 14452 14452 E AndroidRuntime: at androidx.fragment.app.FragmentActivity.startActivityForResult(FragmentActivity.java:676)
09-20 02:34:02.603 14452 14452 E AndroidRuntime: at android.app.Activity.startActivityForResult(Activity.java:5150)
09-20 02:34:02.603 14452 14452 E AndroidRuntime: at androidx.fragment.app.FragmentActivity.startActivityForResult(FragmentActivity.java:663)
09-20 02:34:02.603 14452 14452 E AndroidRuntime: at org.lineageos.lineageparts.privacyguard.PrivacyGuardManager.onOptionsItemSelected(PrivacyGuardManager.java:414)
09-20 02:34:02.603 14452 14452 E AndroidRuntime: at android.app.Fragment.performOptionsItemSelected(Fragment.java:2681)
09-20 02:34:02.603 14452 14452 E AndroidRuntime: at android.app.FragmentManagerImpl.dispatchOptionsItemSelected(FragmentManager.java:3189)
09-20 02:34:02.603 14452 14452 E AndroidRuntime: at android.app.FragmentController.dispatchOptionsItemSelected(FragmentController.java:373)
09-20 02:34:02.603 14452 14452 E AndroidRuntime: at android.app.Activity.onMenuItemSelected(Activity.java:4140)
09-20 02:34:02.603 14452 14452 E AndroidRuntime: at androidx.fragment.app.FragmentActivity.onMenuItemSelected(FragmentActivity.java:384)
09-20 02:34:02.603 14452 14452 E AndroidRuntime: at com.android.internal.policy.PhoneWindow.onMenuItemSelected(PhoneWindow.java:1255)
09-20 02:34:02.603 14452 14452 E AndroidRuntime: at com.android.internal.view.menu.MenuBuilder.dispatchMenuItemSelected(MenuBuilder.java:787)
09-20 02:34:02.603 14452 14452 E AndroidRuntime: at com.android.internal.view.menu.MenuItemImpl.invoke(MenuItemImpl.java:151)
09-20 02:34:02.603 14452 14452 E AndroidRuntime: at com.android.internal.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:934)
09-20 02:34:02.603 14452 14452 E AndroidRuntime: at com.android.internal.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:924)
09-20 02:34:02.603 14452 14452 E AndroidRuntime: at com.android.internal.view.menu.MenuPopup.onItemClick(MenuPopup.java:128)
09-20 02:34:02.603 14452 14452 E AndroidRuntime: at android.widget.AdapterView.performItemClick(AdapterView.java:330)
09-20 02:34:02.603 14452 14452 E AndroidRuntime: at android.widget.AbsListView.performItemClick(AbsListView.java:1190)
09-20 02:34:02.603 14452 14452 E AndroidRuntime: at android.widget.AbsListView$PerformClick.run(AbsListView.java:3198)
09-20 02:34:02.603 14452 14452 E AndroidRuntime: at android.widget.AbsListView$3.run(AbsListView.java:4116)
09-20 02:34:02.603 14452 14452 E AndroidRuntime: at android.os.Handler.handleCallback(Handler.java:883)
09-20 02:34:02.603 14452 14452 E AndroidRuntime: at android.os.Handler.dispatchMessage(Handler.java:100)
09-20 02:34:02.603 14452 14452 E AndroidRuntime: at android.os.Looper.loop(Looper.java:214)
09-20 02:34:02.603 14452 14452 E AndroidRuntime: at android.app.ActivityThread.main(ActivityThread.java:7356)
09-20 02:34:02.603 14452 14452 E AndroidRuntime: at java.lang.reflect.Method.invoke(Native Method)
09-20 02:34:02.603 14452 14452 E AndroidRuntime: at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
09-20 02:34:02.603 14452 14452 E AndroidRuntime: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)