Issues with the map endpoint

I'm having issues getting the map endpoint to return page numbers close to the number I know exist for most domains. I know there are limits in the alpha around smart results but it seems to even be significantly undercounting sitemaps. For example I've been testing it on bard.edu, which I know contains over 9000 pages. The sitemap contains 4000 pages but when I use the map endpoint as follows I only get about 2000 pages. Is this expected behavior. I'm seeing similar results across all domains I've tested it on, with the results being significantly lower than the sitemap.
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