Second person cannot enter the partition (world) in split screen

I was going to play minecraft with my brother in split screen but my brother couldn't log in. Now I explain in detail. The screen was split in two. Then the loading screen appeared at the bottom and it did not continue in the creating terrain section. While playing from a different account on split screen, Omer-Emekci59 account cannot enter my section on split screen and this only happens in my section. The name of the section that causes trouble is Bismillah. Please help me.After waiting for about half an hour, Bide could not enter the Bismillah section of Omer-Emekci59 account yet.