src/java.desktop/share/classes/com/sun/imageio/plugins/png/PNGImageReader.java

*** 1696,1702 ****
--- 1696,1703 ----
      private void resetStreamSettings() {
          gotHeader = false;
          gotMetadata = false;
          metadata = null;
          pixelStream = null;
+         imageStartPosition = -1L;
      }
  }