Not really, the water should evaporate when you turn and handle and treat the frame and by the time it is painted and assembled it should be dry. Usually the inlets for water is small or sealed (covered by the head bearing for example) so during ordinary use, rain and washing, tube inside rust is not a big issue.
Sometimes there is small drilled holes at the low points, mainly to let hot gases out when brazing together at manufacture. I keep those open if/or when I find any. The danger is standing water and storing it improperly.
I trust you avoid storing it in a damp cellar, or a dirt floor barn in a mountainous wooded area with leaking roof, or close to a sea or ocean...
Restoring an already heavy rusted frame or fork should be done with reflection, caution and suspicion! just because it has been stored improperly. It might be necessary to make thorough inspection even with a snake camera inside the tubes. Double caution if a rusted tube is bent or cracked. A lot, in fact most of a tube strength is in the surface, both inside and outside. A bike frame or fork is engineered with minimum weight in mind and rely heavily on the integrity of the parts involved.
