The Environment Community Project (The Ocean Project)

Hello!
I ran into a problem that I don’t know how to solve, since I just started to study Unreal.
The problem looks like this - the ship controlled by the character disappears in the loaded location if the map is made using World Composition and the size limit of only 20 km is removed.
The loss is similar to that of a 20 km zone.
That’s just that there is no problem with the character, he runs everywhere and does not disappear, even if the card has a size of 50km by 50km.
Maybe someone knows how to fix this?