If you submit a bugnote using Markdown styling with a prefix of a greater than symbol '>' at the beginning of the line, it is converted into a blockquote. The blockquote contains styling of 'color:#777;' - this hex colour reference is converted into a bug link, in the middle of the blockquote's style="..." - which destroys the layout (see attached image).

My temporary workaround for this is to modify 'string_api.php' line 382 from:

    381         $p_string = preg_replace_callback(
    382                 '/(^|[^\w&])' . preg_quote( $t_tag, '/' ) . '(\d+)\b/',
    383                 $s_bug_link_callback[$p_include_anchor][$p_detail_info][$p_fqdn],
    384                 $p_string
    385         );

to become:

    381         $p_string = preg_replace_callback(
    382                 '/(^|[^\w&:])' . preg_quote( $t_tag, '/' ) . '(\d+)\b/',
    383                 $s_bug_link_callback[$p_include_anchor][$p_detail_info][$p_fqdn],
    384                 $p_string
    385         );

Adding the extra exclusion of ':' means that it won't pickup CSS attributes closely spaced to the '#' - but this obviously is not a good fix as it is vulnerable to changes, and restricts how a bug can be referred to.