sortpom: Invalid sorting on line break in artifactId value

Settings:

      <plugin>
        <groupId>com.github.ekryd.sortpom</groupId>
        <artifactId>sortpom-maven-plugin</artifactId>
        <version>2.13.1</version>
        <configuration>
          <keepBlankLines>true</keepBlankLines>
          <createBackupFile>false</createBackupFile>
          <expandEmptyElements>false</expandEmptyElements>
          <sortModules>true</sortModules>
          <sortDependencies>scope,groupId,artifactId</sortDependencies>
          <sortProperties>true</sortProperties>
          <sortPlugins>groupId,artifactId</sortPlugins>
          <spaceBeforeCloseEmptyElement>false</spaceBeforeCloseEmptyElement>
        </configuration>
      </plugin>

Before sorting:

    <dependency>
      <groupId>foo.bar</groupId>
      <artifactId>baz</artifactId>
    </dependency>

    <dependency>
      <groupId>foo.bar</groupId>
      <artifactId>
        foo.bar.veryLongArtifactId
      </artifactId>
    </dependency>

After first sorting:

    <dependency>
      <groupId>foo.bar</groupId>
      <artifactId>foo.bar.veryLongArtifactId
      </artifactId>
    </dependency>

    <dependency>
      <groupId>foo.bar</groupId>
      <artifactId>baz</artifactId>
    </dependency>

On restart:

    <dependency>
      <groupId>foo.bar</groupId>
      <artifactId>baz</artifactId>
    </dependency>

    <dependency>
      <groupId>foo.bar</groupId>
      <artifactId>foo.bar.veryLongArtifactId
      </artifactId>
    </dependency>

But after formatting:

    <dependency>
      <groupId>foo.bar</groupId>
      <artifactId>
        foo.bar.veryLongArtifactId
      </artifactId>
    </dependency>

    <dependency>
      <groupId>foo.bar</groupId>
      <artifactId>baz</artifactId>
    </dependency>

Does not change on subsequent launches.

But baz I expect first.