[Avodah] Mistaken Minhagim?

[Rich, Joel]

In a recent piece on Torah Musings R'Gil Student wrote about R'C Pilaggi mentioning minhagim which were incorrect but the Rabbis were unable to stop them. Does anyone know the earliest example of such? This is an issue I wonder about since we often seem to say that minhagim should continue since "obviously" earlier Rabbis approved them and the communities were all holy)
KT
Joel Rich

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