Hey
For short posts, there should be no title in the feed. The Timeline display rules page has all the details. Here’s an example feed with one short post:
<rss xmlns:atom="http://www.w3.org/2005/Atom" version="2.0">
<channel>
<title>Feed for Micro.blog</title>
<description>Short posts from me to you.</description>
<link>https://example.com/</link>
<atom:link href="https://example.com/microblog.xml" rel="self" type="application/rss+xml" />
<pubDate>Mon, 21 Nov 2022 16:36:46 +0100</pubDate>
<lastBuildDate>Mon, 21 Nov 2022 16:36:46 +0100</lastBuildDate>
<item>
<description>
<p>Hello, world! 🎉</p>
</description>
<pubDate>Mon, 21 Nov 2022 16:36:16 +0100</pubDate>
<link>https://example.com/1669033432/</link>
<guid isPermaLink="true">https://example.com/1669033432/</guid>
</item>
</channel>
</rss>