I had the same exact issue and it was coming from a select2 JS conflict between “ACF Pro” and “Paid Memberships Pro” plugins. Once I used wp_deregister_script on the PMPro enqueue of select2, ACF started to save again as a serialized array. The weird part is it used to work ok until the last ACF update (PRO v5.5.10).
I know it is not a good solution to deregister JS/CSS of another plugin so there is probably a better solution to fix the conflict.
Actually, not that I know of. The problem is that the two plugins are using 2 different versions of select2. In your case the Paid Memberships Pro version of the script was being registered first. The way it works, ACFs later registration of a different version with the same “handle” is ignored. If ACF’s registration were to run first then the other plugins registration would be ignored. What order they happen in has a lot to do with the order that WP loads plugins, and this can be effected by unintsalling, installing, activation and deactivation of plugins.
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