Details/Summary wont parse parsedown

According to the parsedown doc https://michaelcurrin.github.io/dev-cheatsheets/cheatsheets/markdown/collapsible-items.html

If i put parsedown code in a details tag surrounded by empty lines, the code should be parsed and be rendered as HTML. But that failed, i get the full text.

that should work like this :

tile

• here we are
• here we are again