Hi Tom,
That should definitely work in that case as well, since the same code is used to request the field values from ACF – which apparently is not working. There was an issue with the get_field_object(..) ACF function, that was supposedly circumvented in the current search plugin release. Looks like there are still cases where the bypass solution does not work either.
Can you please add temporary FTP and back-end access? I will have to debug this via editing the search files directly to see why the values aren’t returned as they should be.