Bug overview description.
The content of set/atom's summary tag isn't properly HTML-escaped. This particular instance is due to the text <3 in the description of set #4593, which causes an XML parsing error since the < is not escaped to <. It is properly escaped in the feed entry's content tag, however.
What part(s) of the site page(s) are affected?
What is the expected behavior?
Feed parses properly.
What actual behavior is given instead?
Feed fails to parse.
Can you reproduce the bug every time?
Yes.
What steps did you take to replicate this bug?
Use the set Atom feed.
Errors or other messages returned (if any).
XML parsing failed: syntax error (Line: 403, Character: 42)