UnsupportedOperationException when different package rules from DRL and RF

java.lang.UnsupportedOperationException
	at java.base/java.util.AbstractCollection.add(AbstractCollection.java:267)
	at org.drools.modelcompiler.builder.ModelBuilderImpl.findPackages(ModelBuilderImpl.java:138)
	at org.drools.modelcompiler.builder.ModelBuilderImpl.doSecondBuildStep(ModelBuilderImpl.java:110)
	at org.drools.compiler.builder.impl.CompositeKnowledgeBuilderImpl.build(CompositeKnowledgeBuilderImpl.java:115)
	at org.drools.compiler.builder.impl.CompositeKnowledgeBuilderImpl.build(CompositeKnowledgeBuilderImpl.java:99)
	at org.drools.compiler.kie.builder.impl.AbstractKieProject.buildKnowledgePackages(AbstractKieProject.java:270)
	at org.drools.compiler.kie.builder.impl.AbstractKieProject.buildKnowledgePackages(AbstractKieProject.java:216)
	at org.drools.compiler.kie.builder.impl.AbstractKieProject.verify(AbstractKieProject.java:80)
	at org.drools.compiler.kie.builder.impl.KieBuilderImpl.buildKieProject(KieBuilderImpl.java:277)
	at org.drools.compiler.kie.builder.impl.KieBuilderImpl.buildAll(KieBuilderImpl.java:245)
	at org.drools.compiler.kie.builder.impl.KieBuilderImpl.buildAll(KieBuilderImpl.java:202)
	at org.drools.testcoverage.common.util.KieUtil.getKieBuilderFromKieFileSystem(KieUtil.java:139)
	at org.drools.testcoverage.common.util.KieUtil.getKieBuilderFromKieFileSystem(KieUtil.java:126)
	at org.drools.testcoverage.common.util.KieUtil.getKieBuilderFromResources(KieUtil.java:113)
	at org.drools.testcoverage.common.util.KieUtil.getKieBuilderFromClasspathResources(KieUtil.java:179)
	at org.drools.testcoverage.common.util.KieBaseUtil.getKieBaseFromClasspathResources(KieBaseUtil.java:55)
	at org.drools.mvel.integrationtests.PackageInMultipleResourcesTest.testDifferentPackageRulesInDRLAndRF(PackageInMultipleResourcesTest.java:72)