RSRP-288412: Invalid casting corrections

ReSharper 6.1.42.60. Given this:

ICollection<ICollection<Stream>> Fun() {
    return new List<List<MemoryStream>>();
}

ReSharper offers this correction:

ICollection<ICollection<Stream>> Fun() {
    return (ICollection<ICollection<Stream>>) new List<List<MemoryStream>>();
}

or alternatively:

ICollection<ICollection<Stream>> Fun() {
    return new List<List<MemoryStream>>() as ICollection<ICollection<Stream>>;
}

Both compile without errors but are invalid fixes for the problem. The former throws InvalidCastException, the latter always returns null (obviously not the intended behavior).

A solution to this could be:

ICollection<ICollection<Stream>> Fun() {
    return new List<List<MemoryStream>>()
    	.Select(x => (ICollection<Stream>) x.Select(y => (Stream) y).ToList()).ToList();
}

I'd even prefer if it didn't suggest anything at all instead of suggesting invalid fixes. I can also see this being quite harmful and confusing for C# newbies...