fix: add back clear segmentation representations (#5336)

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

@@ -417,6 +417,11 @@ class CornerstoneViewportService extends PubSubService implements IViewportServi
     // and we would lose the presentation.
     this.storePresentation({ viewportId: viewportInfo.getViewportId() });
 
+    // Todo: i don't like this here, move it
+    this.servicesManager.services.segmentationService.clearSegmentationRepresentations(
+      viewportInfo.getViewportId()
+    );
+
     if (!viewportInfo) {
       throw new Error('element is not enabled for the given viewportId');
     }