SA1137 does not triggered in init accessor attribute list

[bjornhellander]

class MyClass
{
    public int X
    {
        [Attr1]
         [Attr2] // SA1137
        set
        {
        }
    }

    public int Y
    {
        [Attr1]
         [Attr2] // No SA1137!
        init
        {
        }
    }
}

I expect SA1317 (Elements should have the same indentation) to trigger in both attribute lists above, but it does not trigger in the init accessor attribute list.