I’ve worked with ACF and WPML quite a bit myself and we’ve developed the habit that if you want to create a translation with the content copied you’d have to go into the post/page and then duplicate it, head over to the new post/page and hit the translate separately button.
I’m not surprised why WPML blame ACF. Honestly my experience with their support is pretty lousy (and I’m not the average joe who run a hobby-site). I’m not saying the issue isn’t with ACF but to my knowledge ACF uses standard post_meta values which WPML should be able to copy when making a new translation.. I’ve made a copy-function of my own involving ACF meta fields without issues (not related to WPML) so…
