[Xiaomi Mi 9 ROMs, Kernels, Recoveries, & Other Dev] gmbhneo:
Here is a logcat of the red border.

04-19 16:49:30.875 1330 5160 I notification_panel_revealed: 3
04-19 16:49:30.876 2890 5050 D SubscriptionController: [getActiveSubscriptionInfo]+ subId=1 subInfo={id=1, iccId=8949227004705429040 simSlotIndex=0 carrierId=1454 displayName=Simply carrierName=Simply nameSource=4 iconTint=-16746133 mNumber= dataRoaming=0 iconBitmap=android.graphics.Bitmap@bbe7870 mcc 262 mnc 07mCountryIso=de isEmbedded false nativeAccessRules null cardString=8949227004705429040F cardId=0 isOpportunistic false mGroupUUID=null mIsGroupDisabled=false profileClass=-1 ehplmns = [26207, 26203] hplmns = [26207, 26207, 26203] subscriptionType=0 mGroupOwner=null carrierConfigAccessRules=null}
04-19 16:49:29.603 0 0 I [ FTS ] fts_leave_pointer_event_handler: Event 0x33 - release ID[0] type = 1
04-19 16:49:30.966 22813 22813 D StatusBar: disable<e i a s b h r c s > disable2<q i n >
04-19 16:49:30.968 22813 22813 D StrictMode: StrictMode policy violation; ~duration=48 ms: android.os.strictmode.CustomViolation: Warning: attempt to read pixels from hardware bitmap, which is very slow operation
04-19 16:49:30.968 22813 22813 D StrictMode: at android.os.StrictMode$AndroidBlockGuardPolicy.onCustomSlowCall(StrictMode.java:1523)
04-19 16:49:30.968 22813 22813 D StrictMode: at android.os.StrictMode.noteSlowCall(StrictMode.java:2471)
04-19 16:49:30.968 22813 22813 D StrictMode: at android.graphics.Bitmap.noteHardwareBitmapSlowCall(Bitmap.java:662)
04-19 16:49:30.968 22813 22813 D StrictMode: at android.graphics.Bitmap.copy(Bitmap.java:688)
04-19 16:49:30.968 22813 22813 D StrictMode: at com.android.systemui.crdroid.ImageUtilities.screenshotSurface(ImageUtilities.java:56)
04-19 16:49:30.968 22813 22813 D StrictMode: at com.android.systemui.statusbar.phone.StatusBar.updateBlurVisibility(StatusBar.java:5240)
04-19 16:49:30.968 22813 22813 D StrictMode: at com.android.systemui.statusbar.phone.NotificationPanelView.updateNotificationTranslucency(NotificationPanelView.java:2352)
04-19 16:49:30.968 22813 22813 D StrictMode: at com.android.systemui.statusbar.phone.NotificationPanelView.onHeightUpdated(NotificationPanelView.java:2275)
04-19 16:49:30.968 22813 22813 D StrictMode: at com.android.systemui.statusbar.phone.PanelView.setExpandedHeightInternal(PanelView.java:895)
04-19 16:49:30.968 22813 22813 D StrictMode: at com.android.systemui.statusbar.phone.PanelView.setExpandedHeight(PanelView.java:822)
04-19 16:49:30.968 22813 22813 D StrictMode: at android.animation.PropertyValuesHolder.nCallFloatMethod(Native Method)
04-19 16:49:30.968 22813 22813 D StrictMode: at android.animation.PropertyValuesHolder.access$400(PropertyValuesHolder.java:38)
04-19 16:49:30.968 22813 22813 D StrictMode: at android.animation.PropertyValuesHolder$FloatPropertyValuesHolder.setAnimatedValue(PropertyValuesHolder.java:1387)
04-19 16:49:30.968 22813 22813 D StrictMode: at android.animation.ObjectAnimator.animateValue(ObjectAnimator.java:990)
04-19 16:49:30.968 22813 22813 D StrictMode: at android.animation.ValueAnimator.animateBasedOnTime(ValueAnimator.java:1349)
04-19 16:49:30.968 22813 22813 D StrictMode: at android.animation.ValueAnimator.doAnimationFrame(ValueAnimator.java:1481)
04-19 16:49:30.968 22813 22813 D StrictMode: at android.animation.AnimationHandler.doAnimationFrame(AnimationHandler.java:146)
04-19 16:49:30.968 22813 22813 D StrictMode: at android.animation.AnimationHandler.access$100(AnimationHandler.java:37)
04-19 16:49:30.968 22813 22813 D StrictMode: at android.animation.AnimationHandler$1.doFrame(AnimationHandler.java:54)
04-19 16:49:30.968 22813 22813 D StrictMode: at android.view.Choreographer$CallbackRecord.run(Choreographer.java:965)
04-19 16:49:30.968 22813 22813 D StrictMode: at android.view.Choreographer.doCallbacks(Choreographer.java:791)
04-19 16:49:30.968 22813 22813 D StrictMode: at android.view.Choreographer.doFrame(Choreographer.java:722)
04-19 16:49:30.968 22813 22813 D StrictMode: at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:952)
04-19 16:49:30.968 22813 22813 D StrictMode: at android.os.Handler.handleCallback(Handler.java:883)
04-19 16:49:30.968 22813 22813 D StrictMode: at android.os.Handler.dispatchMessage(Handler.java:100)
04-19 16:49:30.968 22813 22813 D StrictMode: at android.os.Looper.loop(Looper.java:214)
04-19 16:49:30.968 22813 22813 D StrictMode: at android.app.ActivityThread.main(ActivityThread.java:7356)
04-19 16:49:30.968 22813 22813 D StrictMode: at java.lang.reflect.Method.invoke(Native Method)
04-19 16:49:30.968 22813 22813 D StrictMode: at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
04-19 16:49:30.968 22813 22813 D StrictMode: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)
04-19 16:49:30.969 1330 1532 I DropBoxManagerService: add tag=system_app_strictmode isTagEnabled=true flags=0x2
04-19 16:49:31.376 1330 5160 I sysui_multi_action: [757,128,758,1,793,6300,794,0,795,6300,796,26,798,1,806,android,857,DEVELOPER,858,2,947,0,1395,3,1500,6194,1688,1]
04-19 16:49:31.376 1330 5160 I sysui_multi_action: [757,804,799,note_freshness,801,6300,802,1]
04-19 16:49:31.376 1330 5160 I notification_visibility: [-1|android|26|null|1000,1,6300,6300,0,1]
04-19 16:49:31.377 1330 5160 I sysui_multi_action: [757,128,758,1,793,6302,794,0,795,6302,796,32,798,2,806,android,857,USB,858,1,947,0,1395,3,1500,6199,1688,1]
04-19 16:49:31.377 1330 5160 I sysui_multi_action: [757,804,799,note_freshness,801,6302,802,1]
04-19 16:49:31.377 1330 5160 I notification_visibility: [-1|android|32|null|1000,1,6302,6302,0,2]
04-19 16:49:31.377 1330 5160 I sysui_multi_action: [757,128,758,1,793,254972,794,0,795,254972,796,64278,797,newstab|5752242353_story_daily_digest,798,0,806,com.instagram.android,857,ig_reminders,858,3,947,0,1395,3,1500,254870,1688,1,1745,2098068913]
04-19 16:49:31.377 1330 5160 I sysui_multi_action: [757,804,799,note_freshness,801,254972,802,1]
04-19 16:49:31.378 1330 5160 I notification_visibility: [0|com.instagram.android|64278|newstab|5752242353_story_daily_digest|10247,1,254972,254972,0,0]
04-19 16:49:31.024 0 0 I FG : status_change_work: charge_status:1 charge_type:3 charge_done:0
04-19 16:49:31.032 0 0 W healthd : battery l=89 v=4290 t=26.5 h=2 st=2 c=-322 fc=3142000 cc=53 chg=u
04-19 16:49:32.391 22813 23282 D PowerUI : can't show warning due to - plugged: true status unknown: false
04-19 16:49:32.981 1330 1565 W BroadcastQueue: Background execution not allowed: receiving Intent { act=android.intent.action.DROPBOX_ENTRY_ADDED flg=0x10 (has extras) } to com.google.android.gms/.stats.service.DropBoxEntryAddedReceiver
04-19 16:49:32.981 1330 1565 W BroadcastQueue: Background execution not allowed: receiving Intent { act=android.intent.action.DROPBOX_ENTRY_ADDED flg=0x10 (has extras) } to com.google.android.gms/.chimera.GmsIntentOperationService$PersistentTrustedReceiver