Markdown copy-paste bug: link jumps

[i3v]

I'm copying a mere line of text from my own older post to quote it in a new post.
This line got 3 embedded urls, two of which are copied correctly, but the 3rd breaks weirdly.

Reproduction Steps

1. Select the sentence below and hit CTRL+C:

   • Blah-blah [1], [2] foo z2-3, bar [3].
   • Underlying markdown code:

     Blah-blah [[1](https://goo.gl)], [[2](https://goo.gl)] foo z2-3, bar [[3](https://goo.gl)].
     

   • Underlying html code (obtained with Right-click -> Inspect -> Copy element):

   <p dir="auto">Blah-blah [<a href="https://goo.gl" rel="nofollow">1</a>], [<a href="https://goo.gl" rel="nofollow">2</a>] foo z2-3, bar [<a href="https://goo.gl" rel="nofollow">3</a>].</p>
   

2. Find any "Add a comment" text input field on https://github.com/ and CTRL+V there. The result looks like this (note that the last link suddenly "jumped"):

   • Blah-blah [1], [2] foo z2-3, bar [3].

   • Same as code:

     Blah-blah [[1](https://goo.gl/)], [[2](https://goo.gl/)] foo z2-[3](https://goo.gl/), bar [3].
     

I've originally reported this to https://support.github.com/contact/bug-report , but they asked me to report it here.