IParameterSymbol.GetDocumentationCommentXml for primary constructor parameters always return string.Empty

[KyouyamaKazusa0805]

I don't know whether this is a bug ... When I use incremental generator to generate for members for primary constructor parameters, I cannot fetch XML doc comments:

var comment = parameterSymbol.GetDocumentationCommentXml(expandIncludes: true, cancellationToken: ct);

I ensure the variable parameterSymbol has a correct value, but I don't know why comment is "".

Generated source code:

The doc comments of generated members are the default one I have set:

[RikkiGibson]

This looks like a bug in Roslyn. If GetDocumentationCommentXml is returning a meaningful value for a parameter like str below, I think we can be pretty sure that is the case.

class C
{
    /// <param name="str">The parameter</param>
    void M(string str) { }
}

[KyouyamaKazusa0805]

Thank you. I'll open an issue for this topic.