Regression in incremental compilation

java.lang.AssertionError: Expected results are different than actual after operations:
1. CREATE_SESSION: [ package com.rules;
 global java.util.List list
 rule R1 
 when 
   Integer()
 then
   list.add('R1'); 
 end,  package com.rules;
 global java.util.List list
 rule R2 
 when 
   $k: Integer()
   ( Integer(this != 1) or Integer(this == 1) )
 then
   list.add('R2'); 
 end]
2. INSERT_FACTS: [1]
3. FIRE_RULES
4. CHECK_RESULTS: [R1, R2]
5. REMOVE_RULES: [R2]
6. FIRE_RULES
7. CHECK_RESULTS: []
8. REMOVE_RULES: [R1]
9. FIRE_RULES
10. CHECK_RESULTS: []
11. ADD_RULES: [ package com.rules;
 global java.util.List list
 rule R2 
 when 
   $k: Integer()
   ( Integer(this != 1) or Integer(this == 1) )
 then
   list.add('R2'); 
 end]
12. FIRE_RULES
Expected results: 
[R2 ]
Actual results: 
[]

	at org.junit.Assert.fail(Assert.java:88)
	at org.drools.compiler.integrationtests.incrementalcompilation.TestContext.checkResults(TestContext.java:210)
	at org.drools.compiler.integrationtests.incrementalcompilation.TestContext.executeTestOperation(TestContext.java:108)
	at org.drools.compiler.integrationtests.incrementalcompilation.TestContext.executeTestOperations(TestContext.java:72)
	at org.drools.compiler.integrationtests.incrementalcompilation.AbstractAddRemoveRulesTest.runAddRemoveTest(AbstractAddRemoveRulesTest.java:110)
	at org.drools.compiler.integrationtests.incrementalcompilation.AddRemoveRulesTest.testOr2(AddRemoveRulesTest.java:2332)