\typealias doesn't expand with "This is a type alias for [...]"

The docs for \typealias https://doc.qt.io/qt-6/13-qdoc-commands-topics.html#typealias says:

QDoc will automatically generate a sentence in the documentation describing the alias:

This is a type alias for void*.

while it doesn't seem so. An example:

https://doc.qt.io/qt-6/qtextdocument.html#ResourceProvider-typedef

The source doc looks like:

/*!
   \since 6.1
   \typealias QTextDocument::ResourceProvider

   Type alias for std::function\<QVariant(const QUrl&)\>.
*/

So, the automatic expansion doesn't happen and it's manually written text.