I never used mod packs or resource packs. My skin is default steve. I created every single world the same way but i don’t know in which version i created them. All i know is that the world i am playing in rn is created after the 1.16 update. However same thing happened with my last survival world which was about 450 mb in size and i created that one over a year ago. Sadly i deleted it a while ago so i can’t go back to check if it is still the same.
Me:
ps4, minecraft v1.16.61
world size 366.2mb