When using the Xpath option to reference a JSON object attribute to mask within the embedded JSON document, the masking process (doesn't matter what function you use) is applying the given mask rule to the text representation of the path (example: "$['contries'][*]['state_or_provences'][*]['name']"), instead of applying the masking rule to the JSON Attribute text content found at the end of of that path.
Environment
TDM 4.7
Resolution
Downloaded the latest version FastDataMasker-4.7.3226.0.zip . This has the fix.