Autocomplete/IntelliSense does not work for functions that return a record with named fields when using an expression body. #5162

Describe the bug
Autocomplete/IntelliSense does not work for functions that return a record with named fields when using an expression body.

Expression body:

Block body:

To Reproduce

void fun(({int anInt}) Function() callback) {}

void main() {
  fun(() => ());

  fun(() {
    return ();
  });
}

Trigger the autocompletion inside the returned record and you can see that only show the suggestions in the block body, and not in expression body.

Expected behavior
Should show the named fields suggestions.

Please complete the following information:

You can run the Dart: Collect Diagnostic Information command from the VS Code command palette (F1) to easily capture this information or provide it manually.

Dart Code extension: 3.90.0
Flutter extension: 3.90.0
Dart: 3.4.1
Flutter: 3.22.1