Jacob Rios

(Edited)I always play Minecraft For Windows 10 Starter Edition all day. In the first day of 2021, I was thinking about playing in a custom world, then I imported a custom world and when i enter the custom world, I see nothing but Drowned, water, and an island. I don't know how that happened, I didn''t know if it was a bug or glitch. Help get rid of it, please?

I play Minecraft Windows 10 For Starter, every time I import a custom world I see nothing just water and a island. Please help me.