Advanced Custom Fields - Sub-fields are Overwritten in Options Page

Overview of the issue

If you are attempting to translate sub-fields within an Advanced Custom Fields (ACF) options page, you will experience that despite setting the appropriate translation preferences, the nested sub-fields are overwritten.

Workaround

Set the parent and nested repeater fields to Copy Once. In this way, the whole structure will be copied the first time that you translate the options page. However after that, you should be able to adjust the custom fields in both languages.