diff --git a/modules/calib3d/src/chessboard.cpp b/modules/calib3d/src/chessboard.cpp
index 1801a1cbf4..ffbddadf40 100644
--- a/modules/calib3d/src/chessboard.cpp
+++ b/modules/calib3d/src/chessboard.cpp
@@ -1625,36 +1625,30 @@ bool Chessboard::Board::normalizeMarkerOrientation()
             if(!current_cell->marker || !current_cell->right || !current_cell->right->marker)
                 continue;
 
-            if(current_cell->black)
+            if(current_cell->right->top && current_cell->right->top->marker)
             {
-                if(current_cell->right->top && current_cell->right->top->marker)
-                {
-                    rotateLeft();
-                    rotateLeft();
-                    pcell = current_cell->right;
-                    break;
-                }
-                if(current_cell->right->bottom && current_cell->right->bottom->marker)
-                {
-                    rotateLeft();
-                    pcell = current_cell->right;
-                    break;
-                }
+                rotateLeft();
+                rotateLeft();
+                pcell = current_cell->right;
+                break;
             }
-            else
+            if(current_cell->right->bottom && current_cell->right->bottom->marker)
             {
-                if(current_cell->top && current_cell->top->marker)
-                {
-                    rotateRight();
-                    pcell = current_cell;
-                    break;
-                }
-                if(current_cell->bottom && current_cell->bottom->marker)
-                {
-                    // correct orientation
-                    pcell = current_cell;
-                    break;
-                }
+                rotateLeft();
+                pcell = current_cell->right;
+                break;
+            }
+            if(current_cell->top && current_cell->top->marker)
+            {
+                rotateRight();
+                pcell = current_cell;
+                break;
+            }
+            if(current_cell->bottom && current_cell->bottom->marker)
+            {
+                // correct orientation
+                pcell = current_cell;
+                break;
             }
         }
     }
diff --git a/modules/calib3d/test/test_chesscorners.cpp b/modules/calib3d/test/test_chesscorners.cpp
index a63d5b3e83..3d13602780 100644
--- a/modules/calib3d/test/test_chesscorners.cpp
+++ b/modules/calib3d/test/test_chesscorners.cpp
@@ -679,6 +679,26 @@ TEST(Calib3d_AsymmetricCirclesPatternDetector, accuracy) { CV_ChessboardDetector
 TEST(Calib3d_AsymmetricCirclesPatternDetectorWithClustering, accuracy) { CV_ChessboardDetectorTest test( ASYMMETRIC_CIRCLES_GRID, CALIB_CB_CLUSTERING ); test.safe_run(); }
 #endif
 
+TEST(Calib3d_ChessboardWithMarkers, regression_25806_white)
+{
+    const cv::String dataDir = string(TS::ptr()->get_data_path()) + "cv/cameracalibration/";
+    const cv::Mat image = cv::imread(dataDir + "checkerboard_marker_white.png");
+
+    std::vector<Point2f> corners;
+    const bool success = cv::findChessboardCornersSB(image, Size(9, 14), corners, CALIB_CB_MARKER);
+    ASSERT_TRUE(success);
+}
+
+TEST(Calib3d_ChessboardWithMarkers, regression_25806_black)
+{
+    const cv::String dataDir = string(TS::ptr()->get_data_path()) + "cv/cameracalibration/";
+    const cv::Mat image = cv::imread(dataDir + "checkerboard_marker_black.png");
+
+    std::vector<Point2f> corners;
+    const bool success = cv::findChessboardCornersSB(image, Size(9, 14), corners, CALIB_CB_MARKER);
+    ASSERT_TRUE(success);
+}
+
 TEST(Calib3d_CirclesPatternDetectorWithClustering, accuracy)
 {
     cv::String dataDir = string(TS::ptr()->get_data_path()) + "cv/cameracalibration/circles/";