I fix the bug with modify the cpp file ,“\Engine\Source\Runtime\Foliage\Private\FoliageActor.cpp”
from
void FFoliageActor::Uninitialize()
{
check(IsInitialized());
DestroyActors(false);
ActorClass = nullptr;
}
to
void FFoliageActor::Uninitialize()
{
DestroyActors(false);
if (ActorClass != nullptr)
{
ActorClass = nullptr;
}
}