Current GDPR compliant Private Name attribute is not compatible with multi byte strings, and when encountered it fails and returns an empty string for the name_private attribute.
`substr($last_name, 0, 1)` or just `$last_name[0]` is not multi byte compatible, therefore only solution is to use `mb_substr`.
It also supports encoding definitions like `mb_substr($last_name, 0, 1, 'UTF-8')`
Co-authored-by: Nabeel S <nabeelio@users.noreply.github.com>
c518175244