GitHub onebox wrongly adds extra empty lines after each code line in the emails

An original code (correct rendering):

A email with the code (wrong rendering: extra empty lines are added, the screenshot is taken in the GMail web interface):


Are you sure there are empty lines there and its not simply that the CSS is a bit off?

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The line breaks between the <li> tags are preserved because the code is inside the <pre> tag.
Additionally, each line of code has a bottom padding of 10px:


Now it became even worse: the violet background now covers only a part of the code block:

has been resolved for a while