java.lang.UnsupportedOperationException: LeftTupleSinkUpdateAdapter onlys supports assertLeftTuple method calls

Dynamically adding rules with evals and modifying facts that reach those evals might raise the following exception:

Caused by: java.lang.UnsupportedOperationException: LeftTupleSinkUpdateAdapter onlys supports assertLeftTuple method calls
at org.drools.reteoo.EvalConditionNode$LeftTupleSinkUpdateAdapter.modifyLeftTuple(EvalConditionNode.java:462)
at org.drools.reteoo.SingleLeftTupleSinkAdapter.propagateModifyChildLeftTuple(SingleLeftTupleSinkAdapter.java:223)
at org.drools.reteoo.AccumulateNode.evaluateResultConstraints(AccumulateNode.java:637)
at org.drools.reteoo.AccumulateNode.assertObject(AccumulateNode.java:269)
at org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject(CompositeObjectSinkAdapter.java:434)
at org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:362)
at org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:344)
at org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:190)
at org.drools.reteoo.EntryPointNode.assertObject(EntryPointNode.java:147)
at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:1174)
at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:1123)
at org.drools.base.DefaultKnowledgeHelper.insert(DefaultKnowledgeHelper.java:128)
at org.drools.base.DefaultKnowledgeHelper.insert(DefaultKnowledgeHelper.java:122)
at n3_project.helpers6.Rule_rpo_rules_small_n3_1_0.defaultConsequence(Rule_rpo_rules_small_n3_1_0.java:12)
at n3_project.helpers6.Rule_rpo_rules_small_n3_1_0DefaultConsequenceInvoker.evaluate(Rule_rpo_rules_small_n3_1_0DefaultConsequenceInvoker.java:39)
at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:917)
... 5 more