when i used a boat to searching for a new land, i'm having a hard time cause frame lag. then somehow there's some kind of "edge of the world" and doesn't load the chunks anymore and basically my game was buzzing like the picture. and after that my game crashed. the second time i tried again, i found out that when i getting close to the "edge", my map won't move and i can't get out of my boat after i clicked the shift button so many times. and again my game crashed.
after trying for 7 times, i realized i can't pass the "edge" from north, east, west, and south of my island, just some kind of old minecraft pocket edition.