The new Link class in annotation returns an empty* dict and hence creates no link.
I took a look at the link class and can't see any calls to self.update (since the base class is dict) as I do in the other annotation classes.

I reverted back to pypdf.generic.AnnotationBuilder.add_link with the same call parameters and links are inserted as expected.

*possibly 'title' would get through via the kwargs into the super constructor.

Environment

Windows, Python 3.11, running version 3.14.0