Well it seems that suggestion there, to use the bottom button instead of the top button inside the flexible field to add child fields, is resolving the issue as far as being able to carry on working, but it’s not a permanent fix.
Also just to note, if using the top button the added field has a placeholder label of ‘New Field’ and a placeholder name of ‘new_field’ along with the ‘acfcloneindex’ key, instead of the expected empty fields with usual generated key when using the bottom button.
I’d be happy to supply the JSON file if you want to replicate it yourself?
