Appian's a!isNotNullOrEmpty funciton does not work for values {null}, {null,null}
please find below testcase.
code given on community works as expected but not a!isNotNullOrEmpty
https://docs.appian.com/suite/help/25.2/fnc_informational_isnotnullorempty.html#replace-if()-and-isnull()-expressions-with-a!isnotnullorempty
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Yes Correct!Rule only checks if the array exists and has items. It does not check if the items are null.