Cut short traversal when finding top-level base references

hapi-fhir-base/src/main/java/ca/uhn/fhir/parser/BaseParser.java

@@ -287,6 +287,8 @@ public abstract class BaseParser implements IParser {
 	protected void findBaseReferences(List<IBaseReference> allElements, IBase theElement, BaseRuntimeElementDefinition<?> theDefinition) {
 		if (theElement instanceof IBaseReference) {
 			allElements.add((IBaseReference) theElement);
+			// end traversal here, we recursively process nested resources later
+			return;
 		}
 		
 		BaseRuntimeElementDefinition<?> def = theDefinition;