Android phone only gives STATISTICS_FACES once when a face enters a scene

Question

I am having a Camera2 framework issue with face detection on one device, but it works normally on all other devices I've tested so far. Device in question is a Samsung XCover6 Pro.

When face detection is turned on, it only detects a face once, then the Faces array becomes empty on the next capture callback. If I move the phone away and then back to the face, the device detects the face again, only once.

The face detection mode is set to STATISTICS_FACE_DETECT_MODE_SIMPLE. The scene mode is set to CONTROL_SCENE_MODE_DISABLED. AE and AF is set to CONTROL_AF_MODE_AUTO and CONTROL_AE_MODE_ON.

Device is running Android 14. I am having issues with multiple devices of this model, with different software versions.

Is there anything I can try or is this an issue in the camera module itself?

Samsung Camera app in portrait mode detects the face normally, but it is possible that it uses software face detection in the app itself, as it also has the Bokeh effect, that is not available to me through Camera2.

Here is my CaptureCallback:

CameraCaptureSession.CaptureCallback captureCallback = new CameraCaptureSession.CaptureCallback() {

        private void processCapture(CaptureResult result) {
            Rectangle faceRect = new Rectangle();

            if(result != null) {
                if(mode == CameraRequestMode.FACE) {
                    if(faceDetection && detectFace) {
                        Face[] faces = result.get(CaptureResult.STATISTICS_FACES);
                        Point cameraCenter = new Point(mMaxCameraSize.width / 2, mMaxCameraSize.height / 2);

                        if(faces != null) {
                            int i = 0;

                            for(Face face : faces) {
                                log(String.format(Locale.US, "Face found %d %d", i++, System.currentTimeMillis()));

                                Rectangle faceRect1 = new Rectangle(face.getBounds());

                                if(faceRect1.center().distanceToPoint(cameraCenter) < faceRect.center().distanceToPoint(cameraCenter)) {
                                    faceRect = faceRect1;
                                }
                            }
                        }

                        if(faceRect.surface() == 0) {
                            if(detectedFace == null || detectedFace.surface() == 0 || faceRetries++ >= 5) {
                                detectedFace = new Rectangle();
                                faceRetries = 0;
                            }
                        } else {
                            faceRetries = 0;
                            detectedFace = faceRect;

                            log(String.format(Locale.US, "%d %d", (int) detectedFace.position.x, (int) detectedFace.position.y));
                        }

                        Rectangle r = detectedFace.translateFromFaceToScreen(mMaxCameraSize, mScreenSize);
                        VOverlay.setRectangle(r.enlarge(faceZoom), true);
                    } else if(captureRectangle) {
                        setOverlayDefaultCapture();
                    } else {
                        detectedFace = new Rectangle();
                        VOverlay.setRectangle(null, false);
                    }

                    VOverlay.redraw();
                }
            }
        }

        @Override
        public void onCaptureProgressed(@NonNull CameraCaptureSession session, @NonNull CaptureRequest request, @NonNull CaptureResult partialResult) {
            //processCapture(partialResult);
        }

        @Override
        public void onCaptureCompleted(@NonNull CameraCaptureSession session, @NonNull CaptureRequest request, @NonNull TotalCaptureResult result) {
            processCapture(result);
        }

    };

There are errors in the logcat:

2025-02-24 14:18:04.637  1147-1799  CamX                    ven...amera.provider@4.0-service_64  E  [ERROR][STATS_AEC] caecxbankmanager.h:237: GetDataSceneAnalyzer GetDataSceneAnalyzer Invalid data ID -1
2025-02-24 14:18:04.637  1147-1799  CamX                    ven...amera.provider@4.0-service_64  E  [ERROR][STATS_AEC] caecxbankmanager.cpp:1084: UtilGetFloatFromBank Invalid bankID 3 with dataID -1 returning 0.0
2025-02-24 14:18:04.639  1147-1799  CamX                    ven...amera.provider@4.0-service_64  E  [ERROR][META   ] camxmetadatapool.cpp:1272 SetMetadataByTagInternal() Invalid size for tag 0 type 0 maxSize 1 unitsize 1 count 2 pool 3 tagName MainColorCorrectionMode client RealTimeFeatureZSLPreviewRaw_Stats0 pipeline RealTimeFeatureZSLPreviewRaw_0 cameraId -1
2025-02-24 14:18:04.644  1147-20994 CHIUSECASE              ven...amera.provider@4.0-service_64  E  [ERROR  ] chxadvancedcamerausecase.cpp:6617 SetPriorityMetadata() [3rd party DBG][ISO] ERROR, Check, please(20)