@aodesign No, you are correct.
I would try resaving the field in a post and see if that puts it back, or try specifying the post ID as a second parameter just in case.
If not, you can download the last version from the downloads page for a temporary fix if it’s a live site.
My issue was that the postmeta isn’t registered as an acf field but I was using get_field to get the information anyway.