Chunks

why don't keep chunks when I load them in 1.14? Aternos set it up or is it a version of the game? But it is a game to set it somehow so that it still does not read chunks but to be already loaded?

I guess we won't for example i'm up on hill and i watch around and i see the world at 1.13 i saw the world where i was running and at 1.14 i gotta be in a certain location and i'm at the river and i'm going back to that mountain and looking back where the river is and see that river at 1.13 but on 1.14 no. I had no idea how else to explain it and again use translator sorry for grama