Error when embedding flems

[boazblake]

im trying to embed some flems but I am having an issue where everything works ok when I initially route to the page but navigating away from a flems, and then back to it results in an [Error: This document is already in use.] already in use
I tried to find examples of embedded flems, and the only one I could find was your mithril-docs demo, in which I was also able to reproduce the issue, by using the routing on one of the examples.
Example