I was attempting to create a form that updated ACF Data in field group in a Custom Post Type.
Using the Post Update action I added an ACF meta field (e.g. {{dc:acf:post_field field=“movie_description”}}) for the name and the form input (e.g. {{dc:form:data key=“movie_desc”}}) for the value. This initially appeared to update the metadata field, but then ALL posts in that type were completely erased.
I replicated this issue on two separate builds.
Luckily this was done in test environments, but if someone were to attempt this same action on a live site with insufficient backups it could be catastrophic.

