JBS: https://bugs.openjdk.java.net/browse/JDK-8181976 webrev: http://cr.openjdk.java.net/~flar/JDK-8181976/webrev.00/
Simple fix is to carry the double "size requested" values all the way down to where the image pixel scale is determined (not strictly required, but important for precision) and then to scale them with the final image pixel scale before rounding to integer and using them to resize the thumbnail...
...jim
