Enable the system to accept a reservation alteration when there are blocks during the stay as long as those blocks fall on past dates. Currently, if a past block exists anywhere within the reservation window, the system prevents the alteration — even if the alteration only involves adding new future dates that are not blocked.

When a guest wants to extend their stay, the only factor that should matter is whether the new dates are available. Past blocks should not prevent updates, as they no longer impact availability or operational planning.