Endless processing when promoteTransitiveDependencies=true

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>

	<groupId>com.coolworks</groupId>
	<artifactId>bug-test</artifactId>
	<version>1.6.1</version>

	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<maven.compiler.source>1.8</maven.compiler.source>
		<maven.compiler.target>1.8</maven.compiler.target>
	</properties>

	<dependencies>

		<dependency>
			<groupId>org.apache.spark</groupId>
			<artifactId>spark-core_2.10</artifactId>
			<version>1.6.1</version>
			<optional>true</optional>
		</dependency>

	</dependencies>

	<build>
		<plugins>
			<plugin>
				<groupId>org.apache.maven.plugins</groupId>
				<artifactId>maven-shade-plugin</artifactId>
				<version>2.4.3</version>
				<executions>
					<execution>
						<phase>package</phase>
						<goals>
							<goal>shade</goal>
						</goals>
						<configuration>
							<promoteTransitiveDependencies>true</promoteTransitiveDependencies>
							<artifactSet>
								<includes>
									<include>org.apache.spark:spark-core_2.10</include>
								</includes>
							</artifactSet>
						</configuration>
					</execution>
				</executions>
			</plugin>
		</plugins>
	</build>

</project>