fix(multiframe): metadata handling of NM studies and loading order (#4554)

extensions/cornerstone/src/services/ViewportService/CornerstoneViewportService.ts

@@ -1058,6 +1058,11 @@ class CornerstoneViewportService extends PubSubService implements IViewportServi
       // Store the current position presentations for each viewport.
       viewports.forEach(({ id: viewportId }) => {
         const presentation = this._getPositionPresentation(viewportId);
+
+        // During a resize, the slice index should remain unchanged. This is a temporary fix for
+        // a larger issue regarding the definition of slice index with slab thickness.
+        // We need to revisit this to make it more robust and understandable.
+        delete presentation.viewReference.sliceIndex;
         this.beforeResizePositionPresentations.set(viewportId, presentation);
       });
 
@@ -1066,10 +1071,12 @@ class CornerstoneViewportService extends PubSubService implements IViewportServi
       renderingEngine.resize(isImmediate);
       renderingEngine.render();
 
-      // Reset the camera for viewports that should reset their camera on resize,
+      // Reset the camera for all viewports using position presentation to maintain relative size/position
       // which means only those viewports that have a zoom level of 1.
       this.beforeResizePositionPresentations.forEach((positionPresentation, viewportId) => {
-        this.setPresentations(viewportId, { positionPresentation });
+        this.setPresentations(viewportId, {
+          positionPresentation,
+        });
       });
 
       // Resize and render the rendering engine again.