Resolved
Reported for: Advanced Custom Fields Multilingual 2.0.5
Resolved in: Advanced Custom Fields Multilingual 2.1.0
Overview of the issue
When you are using an Advanced Custom Fields (ACF) Block with a clone field, if the same ACF block is added twice in a post, upon updating the post, one of the blocks loses its values.
Workaround
In the clone field use the Group (displays selected fields in a group within this field)
display mode.