Why Poland demanding 1.3 trillion in reparation from Germany now?

Acording to this reuters article Poland is demanding 1.3 trillion in reparation from Germany. If I would not know the sorce I would think this is just what many here call "russian propaganda". The question is defenetly not about why demanding reparations, but about the time this demand is made. I personaly can´t think of a les suitable moment for such demands. All NATO and EU countries including Germany are now united in their solidarity to east european countries like Poland, but at the same time Poland making that demand which defenetly is not good for it relations to Germany.