Wieldy enough, that line likely came from the original developer (ACF/WP Engine) [0].

I believe WordPress.org backported the change and named it v6.3.6.1 at that time [1], before rebranding ACF in a later version (v6.3.6.2).

[0]: https://www.advancedcustomfields.com/changelog/

[1]: https://plugins.trac.wordpress.org/changeset?new=3164480%40a...