Yes, it does seem to do that. A bug I guess. 

If you place a stub trace at the pad with the common net name to the polygon it will pour over the stub. 

[![enter image description here][1]][1]

[![enter image description here][2]][2]


  [1]: https://i.sstatic.net/2P6Vn.png
  [2]: https://i.sstatic.net/eBaNG.png