I too am using Photshop CC and founf this to be an issue. Also found issues using InDesign CC. So far not liking this latest update. Glad I kept CS6 so I can continue with my workflow because this is certainly slowing me down.
Correction... When I clicked on the paths panel and then performed a crop, the vector mask ended up behaving as expected.
When I do an undo and then try to crop my image again, the image and the mask crop like it should.
So now i can't recreate the problem, but I can confirm that there is somethign buggy there.
Message was edited by: johnsom5