I'm submitting a ...

[X] bug report => search github for a similar issue or PR before submitting
[ ] feature request
[ ] support request => Please do not submit support request here, instead see https://github.com/angular/angular/blob/master/CONTRIBUTING.md#question

Current behavior
Dynamically creating radio buttons with dynamic 'name' fields which contain more than one binding expression will not have the correct default values set.
e.g. within a nested ng-repeat:
<input type="radio" name="{{ expression1 }} {{ expression2 }}" ng-model="vm.radioModel[$index]" ... />
(Only the last radio button is selected.)
While using a combined expression will function correctly:
<input type="radio" name="{{ expression1 + expression2 }}" ng-model="vm.radioModel[$index]" ... />

Expected behavior
The default values for the radio options should be set according to the initially bound ng-model.

Minimal reproduction of the problem with instructions
Here's an example plunker demonstrating the issue: Incorrect default values set (plunker)

Here is an example plunker demonstrating the correct functioning of the same example, but using only one combined expression (e.g. name="{{ expression1 + expression2 }}):
Correct default values set (plunker)

Please tell us about your environment:
Windows 10 64bit

• Angular version: 1.5.x, 1.6.x

• Browser: Chrome 55

• Language: ES5