Did poland have rightfull claims to most of east germany? Was it right to give that territory to Poland after WW1 and WW2?

Title, Poland got some very sus territory after being ressurected by ww1, the most scandalous being an considerably lot of east germany and basically half of Ukraine and Byelaruss. They got that territory mainly because the Entente wanted to weaken both the USSR and Germany, it backfired badly for poland almost 2 decades later on WW2. I know that poland wanting Russian territory was BS, but what about the german one?