Illegal values in text field without set validation

Does anyone know how Flow determines what is an illegal value for a text field without any validation setup for that project? We’re hitting a specific text field failing to update due to this and I’m trying to discern what else would drive this determination.

Do you by any chance have the unique value checkbox set on the field?

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Found the solution. We had the string “change” in the field name, which is now a protected string with this update. Change names from “change” and voila.

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