cmssw: ROOT schema evolution problem with recursive class

The class CSCSegment has a member data std::vector<CSCSegment> which RNTuple would be unable to store. I Changed the std::vector<> to hold a different (non-recursive) class and then wrote an IORule to convert the contents of the old vector to the new vector. Although the iorule is run, the resultant object always contains an empty resultant vector, even though during the iorule the resultant vector is not empty.