Hi, i’ve just posted an answer about it, please, check if it can help you:
https://support.advancedcustomfields.com/forums/topic/acf-json-not-updating/#post-54584
I’ve changed the get_stylesheet_diretory() to get_template_directory(), that way i need to update only my parent theme and the child themes inherit.
Don’t need to use the config load and save on each site, only in the main-parent-theme.
