I'm not sure why/how the email on this thread showed up in my inbox today.
Anyways, I think it is a good thing that happened I probably understand what you mean this time around. You meant the 'layer names' are not showing up in the legend element for "class breaks" and "unique value" renderers, no job failure or error right? and because of that you'd not know which layer a legend patch belongs too.
If i understood the issue correctly, then there is a good news that the bug got fixed in 10.3.