I was recently on a flight where the first landing attempt was aborted due to low visibility and we looped around (the entire Metro area) to try again. After the second attempt succeeded there was indeed clapping.
Possibly? It definitely comes from a very different time. I always thought of this as a kind of national embarassement but now I learn it's not just a polish thing.
I've noticed that recently when older poles try to start a clap most younger ones scoff at them and roll their eyes and it fizzles out very quickly