D-23 contains a lot of sodium sulfite which bleaches the dye by design. Its parts are still there in the solution, but arranged by the bleaching so they are colorless. If it worries you, you can add a pinch of sulfite or you can prewash. IIRC, the purple goes away after a while. In any case, I have not found it to be chemically active toward the developer.
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Gadget Gainer
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