Improve CVOC value validation by preventing N/A population in controlled vocabulary fields

Author: ErykKul

src/main/java/edu/harvard/iq/dataverse/engine/command/impl/AbstractDatasetCommand.java

@@ -110,10 +110,14 @@ protected void validateOrDie(DatasetVersion dsv, Boolean lenient) throws Command
         Set<ConstraintViolation> constraintViolations = dsv.validate();
         if (!constraintViolations.isEmpty()) {
             if (lenient) {
-                // populate invalid fields with N/A
+                // populate invalid primitive fields with N/A
+                // Note: controlled vocabulary fields should NOT get N/A values in datasetfieldvalue,
+                // as this creates an inconsistent state where the CV field appears valid but is empty.
+                // See https://github.com/IQSS/dataverse/issues/11900
                 constraintViolations.stream()
                     .filter(cv -> cv.getRootBean() instanceof DatasetField)
                     .map(cv -> ((DatasetField) cv.getRootBean()))
+                    .filter(f -> !f.getDatasetFieldType().isControlledVocabulary())
                     .forEach(f -> f.setSingleValue(DatasetField.NA_VALUE));
 
             } else {