Pattern debug for connection section (or extension section) fails, if in Identification section, a library reference step is configured with precondition - Known Error

Pattern debug for connection section (or extension section) fails, if in Identification section, a library reference step is configured with precondition Description There is no issue running Discovery or debugging the identification section. However debugging connection section fails with error: "Steps were not executed in MID: Please refer to MID Server log". In Agent log, it says: 2022-03-03 17:25:03 (975) Worker-Interactive:PatternDebuggerProbe-5815afb01b82c5904e7ca7da274bcb86 SEVERE *** ERROR *** (28)AbstractPatternExecutor - class com.snc.sw.kb.lang.closure.IfClosure cannot be cast to class com.snc.sw.kb.lang.closure.LibraryReferenceClosure (com.snc.sw.kb.lang.closure.IfClosure and com.snc.sw.kb.lang.closure.LibraryReferenceClosure are in unnamed module of loader 'app') java.lang.ClassCastException: class com.snc.sw.kb.lang.closure.IfClosure cannot be cast to class com.snc.sw.kb.lang.closure.LibraryReferenceClosure (com.snc.sw.kb.lang.closure.IfClosure and com.snc.sw.kb.lang.closure.LibraryReferenceClosure are in unnamed module of loader 'app') at com.snc.sw.pattern.AbstractPatternExecutor.expandNonConditionalLibrary(AbstractPatternExecutor.java:714) at com.snc.sw.pattern.DebuggerPatternExecutor.recursiveExpandLibraries(DebuggerPatternExecutor.java:68) at com.snc.sw.pattern.DebuggerPatternExecutor.extractStepsFromIdentification(DebuggerPatternExecutor.java:52) at com.snc.sw.pattern.AbstractPatternExecutor.executeIdentification(AbstractPatternExecutor.java:319) at com.snc.sw.pattern.AbstractPatternExecutor.executeIdentifications(AbstractPatternExecutor.java:579) at com.service_now.mid.probe.PatternDebuggerProbe.handleTask(PatternDebuggerProbe.java:174) at com.service_now.mid.probe.PatternDebuggerProbe.runProbe(PatternDebuggerProbe.java:119) at com.service_now.mid.probe.ServiceWatchProbe.probe(ServiceWatchProbe.java:35) at com.service_now.mid.probe.AProbe.process(AProbe.java:106) at com.service_now.mid.queue_worker.AWorker.runWorker(AWorker.java:129) at com.service_now.mid.queue_worker.AWorkerThread.run(AWorkerThread.java:20) at com.service_now.mid.threadpool.ResourceUserQueue$RunnableProxy.run(ResourceUserQueue.java:649) at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) at java.base/java.lang.Thread.run(Thread.java:834)

Steps to Reproduce

> open Windows OS - Server pattern, identification section > on step 1 DNS, which is a library reference, create precondition "1" Equals "1" > now debug extension section "Collect MSSQL Info", same error show up: Steps were not executed in MID: Please refer to MID Server log > check agent log, it shows java error - AbstractPatternExecutor - IfClosure cannot be cast to class com.snc.sw.kb.lang.closure.LibraryReferenceClosure

Workaround Workaround is to remove the precondition off the library step, and add the precondition to each individual step included in the library.