I think this is fixed in the latest version already
Summit
Community to discuss Summit, an open-source Lemmy reader for Android.
App (Play Store): https://play.google.com/store/apps/details?id=com.idunnololz.summit
APK: https://github.com/idunnololz/summit-for-lemmy/releases
Source: https://github.com/idunnololz/summit
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Website: https://summit.idunnololz.com/
That fix was to post titles only. Unfortunately that fix will not affect the issue reported here.
Super easy fix. The client actually needed special logic to produce the bug described here. I added this special logic a long time ago because I noticed a lot of people omit the space when they format headers in markdown resulting in misformatted headings however it's technically the fault of the author and not the app. It's easier to have the app not correct for this.