Spark Connect自定义拦截器加载失败：类型转换异常求助

我正尝试按照Spark官方文档实现自定义Spark Connect拦截器，编写了如下简单拦截器代码：

package interceptorserver;

import io.grpc.Metadata;
import io.grpc.ServerCall;
import io.grpc.ServerCall.Listener;
import io.grpc.ServerCallHandler;
import io.grpc.ServerInterceptor;

public class Interceptor implements ServerInterceptor{

    @Override
    public <ReqT, RespT> Listener<ReqT> interceptCall(ServerCall<ReqT, RespT> call, Metadata headers, ServerCallHandler<ReqT, RespT> next) {
        System.out.println("Hello world");
        return next.startCall(call, headers);
    }
}

编译后通过以下命令启动Spark Connect服务器：

./start-connect-server.sh \
    --packages org.apache.spark:spark-connect_2.12:3.4.1 \
    --jars Interceptor.jar \
    --conf spark.connect.grpc.interceptor.classes=interceptorserver.Interceptor

但启动时出现如下错误：

23/07/29 01:17:00 ERROR SparkConnectServer: Error starting Spark Connect server
org.apache.spark.SparkException: [CONNECT.INTERCEPTOR_RUNTIME_ERROR] Generic Spark Connect error. Error instantiating GRPC interceptor: class interceptorserver.Interceptor cannot be cast to class org.sparkproject.connect.grpc.ServerInterceptor (interceptorserver.Interceptor and org.sparkproject.connect.grpc.ServerInterceptor are in unnamed module of loader org.apache.spark.util.MutableURLClassLoader @a5272be)
    at org.apache.spark.sql.connect.service.SparkConnectInterceptorRegistry$.createInstance(SparkConnectInterceptorRegistry.scala:99)
    at org.apache.spark.sql.connect.service.SparkConnectInterceptorRegistry$.$anonfun$createConfiguredInterceptors$4(SparkConnectInterceptorRegistry.scala:67)
    at scala.collection.TraversableLike.$anonfun$map$1(TraversableLike.scala:286)
    at scala.collection.IndexedSeqOptimized.foreach(IndexedSeqOptimized.scala:36)
    at scala.collection.IndexedSeqOptimized.foreach$(IndexedSeqOptimized.scala:33)
    at scala.collection.mutable.ArrayOps$ofRef.foreach(ArrayOps.scala:198)
...

我最初以为org.sparkproject.connect.grpc.ServerInterceptor与io.grpc.ServerInterceptor是不同接口，但查看Spark源码及官方文档后确认，Spark确实使用io.grpc.ServerInterceptor。随后我编写测试验证自定义拦截器确实实现了该接口：

/*
 * This Java source file was generated by the Gradle 'init' task.
 */
package interceptorserver;

import org.junit.Test;

import org.junit.Assert;

public class LibraryTest {
    @Test public void someLibraryMethodReturnsTrue() {
        Interceptor classUnderTest = new Interceptor();
        Assert.assertTrue(classUnderTest instanceof io.grpc.ServerInterceptor);
    }
}

测试通过，但问题仍存在。请问我哪里操作有误？为何会出现类型转换异常？

内容的提问来源于stack exchange，提问作者Matheus