The raw text of the OP in that topic is:
○ → curl https://discuss.kde.org/posts/132565/raw
<p>Leaking memory is impolite. It’s messy, it can suggest logic bugs, and thanks to AI grifters RAM is expensive.
</p>
<hr>
<small>This is a companion discussion topic for the original entry at <a href="https://nicolasfella.de/posts/detecting-leaks-in-kde-ci/?utm_source=atom_feed">https://nicolasfella.de/posts/detecting-leaks-in-kde-ci/?utm_source=atom_feed</a></small>
This is exactly what is rendered in the cooked version.
It’s not a details block being expanded. A click on Show Full Post loads something else, which is the full expansion of the embed, which does not come from the post raw but from additional post metadata.
You can see the network request in your browser when you click on it, here’s the equivalent:
○ → curl -s -H 'accept: application/json' 'https://discuss.kde.org/posts/132565/expand-embed' | jq -r .cooked
<div><div>
<p>Leaking memory is impolite. It’s messy, it can suggest logic bugs, and thanks to AI grifters RAM is expensive.</p>
…
…
…
<p>LSAN is now enabled for some Frameworks CI builds, but ideally it would be enabled for all KDE projects. And of course any leaks found along the way should be fixed.</p>
<p>Happy leak-fixing!</p>
</div></div>
<hr>
<small>This is a companion discussion topic for the original entry at <a href='https://nicolasfella.de/posts/detecting-leaks-in-kde-ci/?utm_source=atom_feed'>https://nicolasfella.de/posts/detecting-leaks-in-kde-ci/?utm_source=atom_feed</a></small>
Did you want to see the contents of the embed? If so, use the above. If not, what are you expecting to see?