Comment (by Samuel Cupp):

As an update, commenting out these set_valids stops the syncs from happening. So, something here is changing the behavior of the code. Are we sure that this is what we want to do here? @Roland Haas @Steven R. Brandt

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2656/presync-syncing-more-than-old-code