Well actually, I see that the the same problem was already reported 6 years ago (https://rt.cpan.org/Public/Bug/Display.html?id=8496), and has not been fixed.
Together with my own unsuccesful emails, I have to imagine that the module author is no longer available, or uninterested in maintaining the module, no ?
I thus tried to follow the advice in the links provided above, sending a polite email with the explanation and patched module to the addresses mentioned there.
Thanks for patiently guiding me.
