[ C7] Variable in string shows as null

I have an RM-legacy app that sets a variable connector to a string value. This was working before, but isn't now.

I have a numeric set to one, then I am incrementing it

I am setting a "connector's variable" to a fixed sting with the number appended.

Currently, it is showing "null" instead of the number (e.g., "Running-null"):

Any ideas what's wrong?

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