Background-size transitions in Chrome 51 - a bug or a feature?

Background-size transitions are no longer working in Chrome 51. I know that it was never supposed to work (see this), but it did and still many people used it. I'm talking about percentage transitions on hover.

I'm wondering if this is a bug in the new Chrome (which is possible, since this version brings a lot of new stuff), or they've decided to remove that transition for good?

No issues in other browsers.

div {
  background: url(http://cdn2.business2community.com/wp-content/uploads/2014/12/Super-Mario-no-longer-the-007.jpg) no-repeat center center;
  background-size: 50%;
  display: inline-block;
  height: 276px;
  width: 460px;
  transition: all 0.5s linear;
}
div:hover {
  background-size: 100%;
}

<div></div>

UPDATE

As @Paran0a noticed, it works fine with vendor-specific prefix, so it's probably a bug (submitted a bug-report):

div {
  background: url(http://cdn2.business2community.com/wp-content/uploads/2014/12/Super-Mario-no-longer-the-007.jpg) no-repeat center center;
  -webkit-background-size: 50%;
  display: inline-block;
  height: 276px;
  width: 460px;
  transition: all 0.5s linear;
}
div:hover {
  -webkit-background-size: 100%;
}