public class DemoBlock extends BlockWithEntity {
    [...]

    @Override
    public <T extends BlockEntity> BlockEntityTicker<T> getTicker(World world, BlockState state, BlockEntityType<T> type) {
        // 如果只需要在服务器上有刻，确保检查 world.isClient
        return validateTicker(type, ExampleMod.DEMO_BLOCK_ENTITY, DemoBlockEntity::tick);
    }