Hi mmjaeger, As far as I know Blocks save their content within . the Post Object itself, here’s a snippet from the original ACF Blocks blog post:
Metaboxes save data as “meta” (individual bits of data connected to the post via the wp_postmeta table) which allows the developer full control over when and where they appear within the theme template files – perfect for bespoke websites.
Blocks save their data within the post_content value (as JSON within HTML comments) which allows the user full control over when and where they appear within the post’s content – perfect for blog posts or rich content areas.
Basically means the content from your original Custom Field setup won’t show in your new block as it’s in a different place.
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