Hello,

I updated our project to 3.10 and noticed that some of our tests failed which I tracked down to some specific syntax that we have in some test widgets to test markdown. Namely the following:

Footnote 1 link[^first].
[^first]: Footnote **can have markup**

Now I am quite certain that footnotes aren't supported, but at least there shouldn't be an assertion. Full markdown source is here: https://sarveshh.github.io/markdownerr/

I looked to see if this was elsewhere reported but I couldn't find it, if it was already reported please close this one :)

Steps to reproduce:

Create a widget and add:

MarkdownBody(
        data: text,
);

Text being the above text or a copy paste from the URL referenced.

Thanks for any input you can have on this!