你用的是什么版本？我刚测试过，效果很好。。。

@SpringBootApplication
public class So63583349Application {
    public static void main(String[] args) {
        SpringApplication.run(So63583349Application.class, args);
    }
    @KafkaListener(topics = "#{'${application.kafka.consumer-config[0].topics}'.split(',')}", id = "so63583349")
    public void listen(String in) {
        System.out.println(in);
    }
}

2020-08-25 13:02:28.384 warn 66237---[o63583349-0-c-1]org.apache.kafka.clients.networkclient:[consumer clientid=consumer-so63583349-1，groupid=so63583349]获取相关id为41的元数据时出错：{topic1=unknown\u topic\u或\u partition，topic2=unknown\u topic\u或\u partition}
对于第二个，不能在属性占位符中使用spel选择。对于这种情况，有一种解决办法：

@SpringBootApplication
public class So63583349Application {
    public static void main(String[] args) {
        SpringApplication.run(So63583349Application.class, args);
    }
    @KafkaListener(topics = "#{@props.consumerConfig.?[name == 'consumer-a'].get(0).topics.split(',')}",
            id = "so63583349")
    public void listen(String in) {
        System.out.println(in);
    }
    @Bean
    Props props() {
        return new Props();
    }
}
@ConfigurationProperties(value = "application.kafka")
class Props {
    List<Properties> consumerConfig;
    public List<Properties> getConsumerConfig() {
        return this.consumerConfig;
    }
    public void setConsumerConfig(List<Properties> consumerConfig) {
        this.consumerConfig = consumerConfig;
    }
}