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The tests: FTNot-q6 FTNot-unconstrained-q6 FTNot-q6-unconstrained-window are duplicates of each other. Two of the three tests should be removed from the test suite.
This is intentional. We have duplicates of tests for some optional features which do not permit the error response indicating that the feature is not supported. That is: in the core part we allow the error, in the optional part we do not.
See comment #2.