Just looking at this and I’m not quite sure I understand why you mark this as a bug.
The way you have set it up, you are asking the query to use the current ACF field value of the post/page the query is published on to order the query (that’s what dynamic fields are for).
If you want to order by the ACF field of every post available inside the query, you’ll want to use the simple static name of the ACF field… No need for dynamic data here.