Saxon

When the saxon:thread attribute is set for xsl:for-each in saxon-ee-12.4 (enterprise edition)，an error occurs occasionally. The exception stack is as follows:

SystemID: file:/data01/NewPublish/commons-java.xsl; Line#: 3083; Column#: 63 net.sf.saxon.trans.XPathException: Accumulator Q{http://ns.saxonica.com/anonymous-type}n1899519096 has not been declared at net.sf.saxon.functions.AccumulatorFn.getAccumulator(AccumulatorFn.java:83) at net.sf.saxon.functions.AccumulatorFn.getAccumulatorValue(AccumulatorFn.java:37) at net.sf.saxon.functions.AccumulatorFn.call(AccumulatorFn.java:154) at net.sf.saxon.expr.SystemFunctionCall$SystemFunctionCallElaborator.lambda$elaborateForPull$1(SystemFunctionCall.java:605) at net.sf.saxon.expr.FilterExpression$FilterExprElaborator.lambda$elaborateForPull$1(FilterExpression.java:1285) at net.sf.saxon.expr.NumberSequenceFormatter$NumberSequenceFormatterElaborator.lambda$elaborateForUnicodeString$0(NumberSequenceFormatter.java:342) at net.sf.saxon.expr.elab.StringElaborator.lambda$elaborateForItem$2(StringElaborator.java:57) at net.sf.saxon.expr.CastExpression$CastExprElaborator.lambda$elaborateForItem$0(CastExpression.java:488) at net.sf.saxon.expr.elab.ItemElaborator.lambda$elaborateForPull$0(ItemElaborator.java:36) at net.sf.saxon.expr.elab.SharedAppendEvaluator.lambda$new$1(SharedAppendEvaluator.java:42) at net.sf.saxon.expr.elab.SharedAppendEvaluator.evaluate(SharedAppendEvaluator.java:63) at net.sf.saxon.expr.SystemFunctionCall$SystemFunctionCallElaborator.lambda$elaborateForItem$6(SystemFunctionCall.java:663) at net.sf.saxon.expr.CastExpression$CastExprElaborator.lambda$elaborateForItem$0(CastExpression.java:488) at net.sf.saxon.expr.elab.ItemElaborator.lambda$elaborateForPull$0(ItemElaborator.java:36) at net.sf.saxon.expr.elab.LazyPullEvaluator.evaluate(LazyPullEvaluator.java:39) at net.sf.saxon.expr.elab.LearningEvaluator.evaluate(LearningEvaluator.java:61) at net.sf.saxon.expr.LetExpression$LetExprElaborator.lambda$setAllVariables$4(LetExpression.java:894) at net.sf.saxon.expr.LetExpression$LetExprElaborator.lambda$elaborateForPush$6(LetExpression.java:940) at net.sf.saxon.expr.instruct.Block$BlockElaborator.lambda$elaborateForPush$1(Block.java:853) at net.sf.saxon.expr.instruct.TemplateRule.applyLeavingTail(TemplateRule.java:376) at net.sf.saxon.trans.Mode.handleRuleNotNull(Mode.java:587) at net.sf.saxon.trans.Mode.applyTemplates(Mode.java:521) at net.sf.saxon.expr.instruct.ApplyTemplates$ApplyTemplatesElaborator.lambda$elaborateForPush$1(ApplyTemplates.java:650) at net.sf.saxon.expr.instruct.Block$BlockElaborator.lambda$elaborateForPush$4(Block.java:895) at net.sf.saxon.expr.instruct.TemplateRule.applyLeavingTail(TemplateRule.java:376) at net.sf.saxon.trans.Mode.handleRuleNotNull(Mode.java:587) at net.sf.saxon.trans.Mode.applyTemplates(Mode.java:521) at net.sf.saxon.expr.instruct.ApplyTemplates$ApplyTemplatesElaborator.lambda$elaborateForPush$1(ApplyTemplates.java:650) at net.sf.saxon.expr.instruct.Block$BlockElaborator.lambda$elaborateForPush$3(Block.java:882) at net.sf.saxon.expr.instruct.TemplateRule.applyLeavingTail(TemplateRule.java:376) at net.sf.saxon.trans.Mode.handleRuleNotNull(Mode.java:587) at net.sf.saxon.trans.Mode.applyTemplates(Mode.java:521) at net.sf.saxon.expr.instruct.ApplyTemplates$ApplyTemplatesElaborator.lambda$elaborateForPush$1(ApplyTemplates.java:650) at net.sf.saxon.expr.elab.PushElaborator.lambda$elaborateForPull$0(PushElaborator.java:38) at net.sf.saxon.expr.instruct.Block$BlockElaborator$BlockIterator.getNthChildIterator(Block.java:832) at net.sf.saxon.expr.instruct.AbstractBlockIterator.next(AbstractBlockIterator.java:66) at net.sf.saxon.value.SequenceExtent.from(SequenceExtent.java:48) at net.sf.saxon.om.SequenceTool.toGroundedValue(SequenceTool.java:55) at com.saxonica.ee.parallel.MultithreadedContextMappingIterator.lambda$mapOneItem$0(MultithreadedContextMappingIterator.java:179) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at java.lang.Thread.run(Thread.java:748)