In JavaFX Preloader support I need to programmatically add and remove dependence between NB projects. For this purpose I use ProjectClassPathModifier.addAntArtifacts and ProjectClassPathModifier.removeAntArtifacts methods, which I expect should provide complementary operations, i.e., after a call to addAntArtifacts followed by removeAntArtifacts with the same set of parameters I would expect the project to get back to the same state as before the calls. However, this seems not to be the case.

The call to addAntArtifacts adds to build-impl.xml:

<antcall target="-maybe-call-dep">
  <param name="call.built.properties" value="${built-jar.properties}"/>
  <param location="${project.JavaFXPreloader24}" name="call.subproject"/>
  <param location="${project.JavaFXPreloader24}/build.xml" name="call.script"/>
  <param name="call.target" value="jar"/>
  <param name="transfer.built-jar.properties" value="${built-jar.properties}"/>
</antcall>

and a similar code for call.target clean. To project.xml it adds

<references xmlns="http://www.netbeans.org/ns/ant-project-references/1">
  <reference>
    <foreign-project>JavaFXPreloader24</foreign-project>
    <artifact-type>jar</artifact-type>
    <script>build.xml</script>
    <target>jar</target>
    <clean-target>clean</clean-target>
    <id>jar</id>
  </reference>
</references>

In Projects window in the IDE it can be seen that the dependence has been added; it is listed under project's Libraries.

Then, the call to removeAntArtifacts with the same parameters seems to work from what is seen in the IDE (the dependence vanishes from Libraries in Projects panel), but build-impl.xml and project.xml remains untouched. The project then still can be built, and build messages show that the dependent project is built as well, what is incorrect. The project then fails to run due to the leftover dependence with

java.lang.ClassNotFoundException: javafxpreloader24.JavaFXPreloader24
	at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
	at java.lang.Class.forName0(Native Method)
	at java.lang.Class.forName(Class.java:247)
	at com.javafx.main.Main.getAppClass(Main.java:442)
	at com.javafx.main.Main.launchApp(Main.java:466)
	at com.javafx.main.Main.main(Main.java:638)
Java Result: 1

Am I right this is a bug in ProjectClassPathModifier or do I miss something here ?