diff --git a/extensions/cornerstone/src/services/SyncGroupService/createHydrateSegmentationSynchronizer.ts b/extensions/cornerstone/src/services/SyncGroupService/createHydrateSegmentationSynchronizer.ts
index 9b437ae6f1f..d255c8ef9af 100644
--- a/extensions/cornerstone/src/services/SyncGroupService/createHydrateSegmentationSynchronizer.ts
+++ b/extensions/cornerstone/src/services/SyncGroupService/createHydrateSegmentationSynchronizer.ts
@@ -88,12 +88,17 @@ const segmentationRepresentationModifiedCallback = async (
     return;
   }
 
-  // Ensure the segmentation representation aligns with the target viewport type.
-  const type: Enums.SegmentationRepresentations =
-    isVolume3DViewportType(viewport)
-      ? Enums.SegmentationRepresentations.Surface
-      : ((segmentationRepresentationType as Enums.SegmentationRepresentations) ??
-        Enums.SegmentationRepresentations.Labelmap);
+  // Ensure the segmentation representation aligns with the target viewport type
+  const is3D = isVolume3DViewportType(viewport);
+  const requestedRepresentation =
+    segmentationRepresentationType as Enums.SegmentationRepresentations;
+  const { Surface, Labelmap } = Enums.SegmentationRepresentations;
+
+  const type: Enums.SegmentationRepresentations = is3D
+    ? Surface
+    : requestedRepresentation && requestedRepresentation !== Surface
+      ? requestedRepresentation
+      : Labelmap;
 
   await segmentationService.addSegmentationRepresentation(targetViewportId, {
     segmentationId,
diff --git a/tests/SEGHydrationFrom3DFourUp.spec.ts b/tests/SEGHydrationFrom3DFourUp.spec.ts
index ce232397a55..d5904bf9027 100644
--- a/tests/SEGHydrationFrom3DFourUp.spec.ts
+++ b/tests/SEGHydrationFrom3DFourUp.spec.ts
@@ -60,6 +60,9 @@ test.describe('3D four up SEG hydration', async () => {
 
     // Wait until all viewports have finished rendering
     await viewportRenderCycle;
+    // Hydration propagates labelmap volumes to MPR viewports asynchronously after the
+    // first render cycle resolves.
+    await waitForViewportsRendered(page, { timeout: 240000 });
 
     await checkForScreenshot({
       page,
diff --git a/tests/screenshots/chromium/SEGHydrationFrom3DFourUp.spec.ts/threeDFourUpAfterSegHydrated.png b/tests/screenshots/chromium/SEGHydrationFrom3DFourUp.spec.ts/threeDFourUpAfterSegHydrated.png
index 84195676641..8fcf19cb6ea 100644
Binary files a/tests/screenshots/chromium/SEGHydrationFrom3DFourUp.spec.ts/threeDFourUpAfterSegHydrated.png and b/tests/screenshots/chromium/SEGHydrationFrom3DFourUp.spec.ts/threeDFourUpAfterSegHydrated.png differ