Site Accelerator/Photon invalidates Atom RSS feeds

[tw2113]

XML Parsing Error: not well-formed
Location: https://www.example.com/blog/feed/atom/
Line Number 19, Column 123:
<icon>https://i0.wp.com/www.example.com/wp-content/uploads/2018/04/example-e1524437311719.png?fit=32%2C32&ssl=1</icon>

Specifically around the ssl=1 and the 1 specifically according to a passing of the feed URL through https://www.feedvalidator.org/

Steps to reproduce the issue

1. Enable Accelerator support for the site.
2. Visit https://www.MYSITE.com/feed/atom/

I can provide a hard example if needed, though I'll want to request permission to provide the domain I have most recently found that has the error.

[jeherve]

This is most likely a duplicate of #8321.