Seems like my RSS feed is broken.
It turns out its outputting 2 blank lines before xml starts. As a result, it ends up being wrongly formatted RSS feed. I tried looking into qa-feed.php code but could not find any issue there. Not sure, where those 2 blank lines are appearing before code gets rendered.
I am on q2a version 1.4.3
Here is the link:
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May 7, 2020: Q2A 1.8.4 released!