@mkeys After playing around with it a bit more, I’m not sure if it is Groups or it could be duplicative terms I had with custom taxonomies and ACF fields.
ACF deals with this well by attaching the key to any field action to avoid namespace collision so you can use the same field name over again (e.g. within repeater fields or groups).
My guess is WordPress is not liking the way I had things set up.
For example, if I have a custom post type of Locations with taxonomy slugs of ‘airport’, ‘train-station’, ‘hotel’ then I had a Group named ‘hotel’. With ACF normally this wouldn’t be a problem but I think it is confusing WP.
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