Incorrect output with : in multiline paragraphs surrounded by em/strong markup

[mn4367]

The following snippet

*Note: This is 
not supported.*

generates:

<p><em>	<meta name="Note" content="This is 
not supported."/>
</em></p>

It happens with any combination of * and _. Taking away the linebreak "fixes" the problem but with longer paragraphs this isn't a good solution. Taking away the : also produces the correct output so I believe that something takes this as some kind of metadata.

It seems that placing a colon (somewhere in but not at the end of) the first line of a multiline paragraph which itself is surrounded by em/strong markup produces this error.

[fletcher]

MMD-6 was released in March -- I am no longer working on v5 (I updated the project description to reflect this as well.)