Author URL not translated in a multilingual instance

Problem/Motivation

On a multilingual (French-Flemish) Drupal 11.4.5 instance equipped with PHP 8.4.24 using the Markdownify Metadata submodule, everything is perfectly translated (metadata, Open Graph tags and schema types) but the node's author URL.

This situation occurs on all nodes, no matter which content type is used to create them.

There is no misconfiguration in /admin/config/regional/content-language and the URL's of the author are displayed in French and in Flamish.

All the nodes are first created in French and then translated in Flemish.

Steps to reproduce

On a multilingual instance, activate and configure the Markdownify module and the Markdownify Metadata submodule.

Create a node and translate it.

Add .md to both URL's and check the author URL.

Live examples on line 6: https://petitefontaine.be/fr/plan-acces.md and its translation https://petitefontaine.be/nl/routebeschrijving.md