I know that a lot of the documentation for ACF still shows using the acf/load_field filter for changing fields. But almost all of the time an acf/prepare_field filter is the better choice. This is a newer hook that was added after most of the documentation was written.
acf/load_field filters will be applied when exporting fields.
Welcome to the Advanced Custom Fields community forum.
Browse through ideas, snippets of code, questions and answers between fellow ACF users