This has been an open issue for more than 4 years. https://github.com/AdvancedCustomFields/acf/issues/83
For one of my own project I created this workaround: https://github.com/AdvancedCustomFields/acf/issues/83#issuecomment-629553379
Meanwhile, someone else seemed to have made it a bit more error proof: https://github.com/AdvancedCustomFields/acf/issues/83#issuecomment-818614596 but I haven’t tested this one.
