I heard recently that this is in fact printed in some version of the Artscroll Siddur but I have not seen it inside.
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It sounds at first glance as if someone is confused and mixed up Av Harahaman of Shema Koleinu with Ahavah Rabbah of Ahavas Olam in which indeed we find some Hasidim switching to Ahavah Rabbah for Shabbos Shaharis.