Thanks! I didn’t even notice that earlier in my scramble to resolve the issue. Turns out that the WP All Import plugin updated a couple hours ago and both work now on their latest versions.
The ACF Pro upgrades have caught us a couple times recently. In my opinion they need to worry a little more about breaking changes.
I can confirm, this issue is happening with us also using hidden/conditional logic in 5.7.8.
I’ve submitted a ticket already to work through a solution.