Polish-German repair workshop for Ukrainian tanks stalled

According to an agreement between Berlin and Warsaw, damaged German Leopard battle tanks from the front lines of the war in Ukraine are to be fixed at a workshop in Poland. So why is it still not operating?

source https://www.dw.com/en/polish-german-repair-workshop-for-ukrainian-tanks-stalled/a-66178032?maca=en-rss-en-ger-1023-rdf