Is this a request or a connection filter? It won't work as a connection filter (r is not available there).
It is an ouptut filter.
What's the core's backtrace?
I will generate this tomorrow (don't have access to the machine today). Thanks ScottP.S. I have done a temporary work around which is to have standard Handler which provides the first call as a parameter, so it does a Subrequest on the first one, then does the expansion (more Subrequests). I have found this has not really worked the way I want, but it did allow me to move forward on my project a little.
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