Catch Error node会把Input0 / input1 的flwovariables 合并在一起，所以不是成功或是失败，而只选择一个变量（这个是一个 ”bug“——AP 18714 ticket")。所以唯一的办法是检查 Catch Error 的Flow var，看看其中 FailingNode 的内容，然后依据这个来做判断 (配置种的 Always generate message =on"
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