CB

If name style is set to a single name field then first, middle, and last do not update. This can be an issue if you want to filter the userlist by lastname (doable with advanced filter since the field it self has been unpublished). This also causes issues if the name style is toggled to a different style after users have been established. It just makes sense to always maintain the name fields.

https://www.joomlapolis.com/forum/153-professional-member-support/231182-problem-with-name-fields

Simple fix is to just add prepareFieldDataSave handling for single name field usage to update first, middle, and last FROM name as needed.