Bug when importing wordpress with categories with a dot

So I’m new to micro.blog and have a long-running blog on Wordpress I wanted to import. However, when micro.blog tries to build the pages, it errors and in the logs, you can see things like

Error: Error building site: failed to render pages: open _site/categories/st.pancras/page/1/index.html: not a directory

Now it seems like any tag/category with a dot breaks in this way (in the above error, the tag was “St.Pancras”. So for example, a couple of my tags were:

docker.io
.NET
St. Pancras
lynda.com

amongst others.

When I delete those tags and let it build again I get no errors.