List item rendered as a header

[rohmansca]

I experienced a strange thing when converting an unordered list.

input:
- one\n-

output:
<h2>- one</h2>\n

expected:
<ul>\n<li>one</li>\n<li></li>\n</ul>\n

how to reproduce:

text="- one\n- "
mr = Redcarpet::Markdown.new(Redcarpet::Render::HTML)
mr.render(text)

redcarped version: 3.6.0

whatever your help, I really appreciate it