I’m using 5.8.0-beta3 & WP 5.0 and experiencing this same issue.
I tried the fix suggested by @elliot above, but the plugin file structure seems a bit different and I cannot find that line of code.
I have copied the example (for testimonials) exactly. I am able to select the location of “Testimonial” when I add the field group, but “Testimonial” does not appear in the editor.
I’m happy to roll back to an earlier beta, but wanted to see if anyone else was having this issue with beta 3 & WP 5.0.
Welcome to the Advanced Custom Fields community forum.
Browse through ideas, snippets of code, questions and answers between fellow ACF users
Helping others is a great way to earn karma, gain badges and help ACF development!
© 2022 Advanced Custom Fields.