patch.diff

--- src/PresentationEngine.ts
+++ src/PresentationEngine.ts
@@ -832,9 +832,23 @@
         this.getChartDataGrid(slideIndex, shapeIndex)
       );

+      const horizontalAxes = [];
+      const verticalAxes = [];
+      for (const format of formats) {
+        if (format.orientation === 'horizontal') horizontalAxes.push(format);
+        else if (format.orientation === 'vertical') verticalAxes.push(format);
+      }
+
+      const allRuns = getChartTickRuns(chartGroup);
+      const horizontalRuns = [];
+      const verticalRuns = [];
+      for (const run of allRuns) {
+        if (run.orientation === 'horizontal') horizontalRuns.push(run);
+        else if (run.orientation === 'vertical') verticalRuns.push(run);
+      }
+
       for (const orientation of ['horizontal', 'vertical'] as const) {
-        const axes = formats.filter((axis) => axis.orientation === orientation);
-        const runs = getChartTickRuns(chartGroup).filter((run) => run.orientation === orientation);
+        const axes = orientation === 'horizontal' ? horizontalAxes : verticalAxes;
+        const runs = orientation === 'horizontal' ? horizontalRuns : verticalRuns;

         if (axes.length === 0 || runs.length === 0) {