m8hue

Sure,

Open up the ACF field group, scroll down to settings and open the tab ‘Group Settings’. There’s a toggle for ‘show in rest api’.

That adds the acf fields for the group to a post in the rest api under ‘acf: [array]’ per post when those ACF fields are filled out for the post.

With that setting active,

1. open a post, fill out an acf field, and publish. Check the /wp-json/wp/v2/post/[$post->ID] for that post to see the acf value.
2. edit the post to include an elementor block from the plugin. & publish.
3. Recheck the link above to see the post is no longer showing ACF Fields in rest.

I did find a single boolean that does seem to be the source of the issue tracing through the function calls.

https://github.com/elementor/block-builder/blob/master/blocks/template-block.php

        return Plugin::elementor()->frontend->get_builder_content( $attributes['selectedTemplate'], true );

Line 122, if the boolean is switched to false, the rest api appears as it should. But looking into the ramifications of that is past what i’ve done on followup.