Image tag with URL in alt text does not parse with github flavored extension set

[jhass]

Probably the autolink extension is breaking it?

Input:

![alt text with http://example.org](https://placekitten.com/50/50)

Expected output

<img src="https://placekitten.com/50/50" alt="alt text with http://example.org">

Actual output:

![alt text with <a href="http://example.org%5D(https://placekitten.com/50/50)">http://example.org](https://placekitten.com/50/50)</a>