Why is start page missing from sitemap.xml?

Question

I'm rather new on the Magento platform, but I've noticed a weird thing on a couple of my clients' websites. The home page is missing from the sitemap.xml.

In all cases the clients' home page is a CMS page and the CMS page has a URL key that is "home". Off course, the page www.client.com/home exists as a page and in the sitemap, but I am missing www.client.com in the sitemap.

This is really frustrating since I want to submit an as accurate as possible sitemap.xml to Google and Bing. Does anyone have a solution for this?