fix #6116

Signed-off-by: zwwhdls <zwwhdls@hotmail.com>

pkg/strvals/parser.go

@@ -305,8 +305,15 @@ func (t *parser) listItem(list []interface{}, i int) ([]interface{}, error) {
 		if err != nil {
 			return list, errors.Wrap(err, "error parsing index")
 		}
+		var crtList []interface{}
+		if len(list) > i {
+			// If nested list already exists, take the value of list to next cycle.
+			crtList = list[i].([]interface{})
+		} else {
+			crtList = list
+		}
 		// Now we need to get the value after the ].
-		list2, err := t.listItem(list, i)
+		list2, err := t.listItem(crtList, i)
 		if err != nil {
 			return list, err
 		}