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I will attempt to answer the first question. ACF uses two types of field names in order to associate the field with its object; as you see in the postmeta table of your DB, only the value is saved (in “meta_value”) for the posts’ field name (in “meta_key”). So, in order to access the rest of the field object (e.g. “label”, “format”, “type”, “choices”, etc.), ACF must be able to look this up using a unique identifier (the key). This ensures that post meta is stored the way same as (and hence, compatible with) native WP meta. So, when ACF gets a field, it looks for the meta_key with the same name as the requested field but prefixed with an underscore – this gives it the key that allows it to find the rest of the object.
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We’re hard at work on ACF 6.1, and Beta 1 is now available 🚀
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This release includes custom post type and taxonomy registration, an improved experience when selecting field types, PHP 8.1 and 8.2 compatibility, and more!
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