I can not answer on all circumstances.
But the error for us, when going from 5.11.4 to 5.12 – is similar to yours.
You have to go in your Field Groups, and enable the WP API again.
BUT BUT BUT:
This might solve it for many – but other problems appear:
ACF fields in the wp rest api json presentation values is not STRING-ONLY as before. “123” becomes 123 – if you have the acf field typ of Number etc.
And ACF Images, here the returned value will be the attachment ID – regardless if you have choosed return object or image path.
/ hejamartin
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This reply was modified 2 years, 8 months ago by hejamartin.