[Escalated to WPML Developers team] ACFML: Custom taxonomy fields set to Copy are editable in non-original language

Using ACFML and ACF Pro. I have created a custom post type, a custom taxonomy and then created an ACF taxonomy field attached to the custom post type. The custom post type and custom taxonomy are set to Translatable in the WPML settings. The ACF taxonomy field for the taxonomy is set to Copy. I add several terms to the taxonomy and translate them. I create a new custom post and select one of the taxonomy terms and save. I create a new version of the post in the 2nd language by clicking the Duplicate checkbox in the Language metabox and then clicking the Duplicate button, then clicking the pencil icon to edit the new post. I update the new post and am told WPML will create a new translated version of the post. I change the taxonomy term selection, and even though there is a Lock icon next to the field, after clicking update and refreshing the page, the taxonomy terms have been changed. If I go back to the original language and change the terms and update, only new ones which are added are updated in the 2nd language version.