Iterate on a Flow Loop Element in an apex collection

Question

I have an apex class that returns a list of a custom class with the following shape

global without sharing class Result {
    @AuraEnabled @InvocableVariable
    global Id recordId;
    @AuraEnabled @InvocableVariable
    global List<Rule__c> rules;
}

The method returning has this shape:

@InvocableMethod
global static List<List<Result>> runRecords(List<Input> input) {
    ...stuff...
}

In the flow that consumes this method, I first iterate (without a problem) over the List of Result records. However, inside of each iteration I wish to iterate over the rules property.

I create a variable to hold the collection (so I can iterate)

However, when I want to assign the property into my collection I run into problems

If I click the caret next Result, no compatible properties appear, even though the List<Rule__c> rules in apex and the variable I created above are (supposedly) of the same type. Changing the operation to "Equals" does not solve the problem either.

PS: FWIW, I am in a scratch org with a namespace set.

Answer 1

I took a weird chance and decided to override the GUI and deploy the change via metadata (see below)

Incredibly, the save worked and the flow now works properly. However, the GUI still does not like the change (so I cannot edit that node manually at all). This is bizarre, but it works