RSS Still Redirecting to Old RSS Replacement URL

I'm working with a site that had had an invalid URL entered in it's RSS Replacement URL field - so when trying to access the RSS feed at the correct URL (sitename.com/slug?format=rss), it was redirecting to this invalid URL. I have now removed that URL and that field is now blank, but the RSS URL continues to redirect to that old, incorrect URL. Is it just a matter of waiting for the servers to update to remove this redirect, or is there something I'm missing?