Property map nested association throws exception when key matches part of the property path.

[basven]

Not sure if this is considered a bug or maybe a documentation update.
I can successfully filter on a.b.c=='some value'.
where a is a manytoOne from the root to 'a' and 'b' is a manytoOne from a to b like this:

`
public class Root{
@manytoone(optional = false, fetch = FetchType.LAZY)
private A a;
}

public class A{
@manytoone(optional = false, fetch = FetchType.LAZY)
private B b;
}

public class B{
private int C;
}
`

When I put that in a property map however I get the following exception:
Unknown property: c from entity A
when the key of the property matches (part of) the property path. In my case I defined it as
put('b', 'a.b.c')

If I change that to something like:
put('myProperty', 'a.b.c')
it works just fine.

I was under the impression that the key part could be any string.

[perplexhub]

Does Root have an attribute named b?