I can confirm that 5.1.7.1 is working fine.
The issue is still present in 5.2.0.
Besides downgrading the plugin version, another workaround is to toggle the conditional to show the required field with the error message and fill it with something. Then toggle back the conditional to what it was before. Now when you submit there won’t be any error message, since all required fields have been filled out regardless of conditional state.
