HTML bleeding into signature when replying. (V2.0beta build 6024)

I have a signature with that includes an HTML variant that looks like:

<hr>  
<table border="0" style="width:100%;">  
<tr>  
<td>Mr. Bert<br/>  
Secret Working Group Secretary</br>  
<A HREF="http://bert.secret-wg.org/">bert.Secret-Wg.org</A><br/>  
<td>  
<td style="text-align:right">  
e-mail: <A HREF="mailto:bert@localhost">bert@localhost</A><br/>  
<Font Size=-4>  
LinkedIn:<A HREF="https://nl.linkedin.com/in/secretwg">Bert</A><br>Twitter: <A href="https://twitter.com/secretwg">@SecretWG</A>  
</Font>  
</td>  
</tr>  
<table>  
<hr>

While the plaintext variety of that is

---
Bert                                                                 bert@localhost  
Secretary  
Secret Working Group                                                 bert.secret-wg.org  
                                                                     LinkedIn: secreting
                                                                     Twitter: secretwg
---

When I reply to messages it seems that the block that is recognized as HTML in the original quoted message bleads into the signature block, which corrupts the plaintext version whenever I start replying in-line.

PS: It seems that the rendering of the plaintext blob in this ticket fails. The hline at the bottom are 3 dashes in reality