Thank you so much for tracking that information down!
Did you ever get a reply? I too am wondering this.
I am a complete dork. I was using the code sample from adding a short to a template I think (https://www.advancedcustomfields.com/resources/displaying-custom-field-values-in-your-theme/)… It works now. Its been a loooooong time since I’ve used your plugin and my brain apparently got rusty.