A bug reported offline by @KrystofS :
Sample markdown that breaks the reader:
When getting the managed exception object for this exception, the runtime will first try to allocate a new managed object <sup>[1]</sup>, and if that fails, will return a pre-allocated, shared, global out of memory exception object.
IIRC the Markdig library represents it with HtmlInline and the parser currently throws because such type is not expected.