update

extensions/dicom-segmentation/src/components/SegmentationPanel/SegmentationPanel.js

@@ -243,6 +243,7 @@ const SegmentationPanel = ({
       labelMapList: [],
       segmentList: [],
       isDisabled: true,
+      selectedSegmentation: -1,
     }));
   }
 

extensions/dicom-segmentation/src/components/SegmentationSelect.js

@@ -3,7 +3,7 @@ import Select from 'react-select';
 
 const SegmentationSelect = ({ value, formatOptionLabel, options }) => (
   <Select
-    value={value}
+    value={value === undefined ? null : value}
     formatOptionLabel={formatOptionLabel}
     styles={segmentationSelectStyles}
     options={options}