Harbor/Port vs. Pop Center Size

Hey All,

I'm not overly familiar with navies in MEPBM, but I have a question
regarding minimum pop center sizes.

The build harbor and improve harbor to port state that a harbor can
only be "attached" to a town, major town, or city and that a port can
only be "attached" to a major town or city.

If I capture a town that has a harbor, does the harbor go away?

If I capture a major town that has a port, does it downgrade to a
harbor?

I would think the answer to these questions would be yes, but I've
been told that Tol Baruth (LR hidden pop center) is a village/harbor
in the 2950 scenario. Is that the exception to the rule?

Thanks in advance...