Is it customary to return dinner plates to a serving hatch after eating breakfast?

I visited Western Camp last year, a themed hotel and camp ground near Energylandia, a large theme park in Zator.

There was a buffet breakfast at the hotel. I noticed most people there returned their plates to a serving hatch to be cleaned.

Is this something done across Poland, or do only certain types of restaurants expect you to return your plates?

As a Brit, I’m used to leaving empty dishes on the table to be cleared by someone working in the restaurant.