Sadly, no I hadn’t. When I first encountered it I searched here and found a post concerning the same issue that had been closed after a month without any replies on the original post:
At the time, maybe mistakenly, I thought it was an isolated occurrence based on how I built my site. I did try a few tests and in the end I just changed my workflow to generate the sitemap manually. I publish locally and use Transmit to sync my site to the live server - so I just edit the local file as required. I hadn’t thought about the issue much since until I saw this new post.