Settings showIf not showing if

[FireWire]

I tried to create a showIf with two select fields but couldn't get it to work properly. I copy/pasted the example from the docs directly in case I was missing something but I still can't get it to work.

My attempt:

<?php

$settings->add([
    'name' => 'image_location_horizontal',
    'label' => 'Image Location',
    'value' => $field->input('image_location_horizontal', 'select', [
        '*right' => 'Right',
        'left' => 'Left',
        'center' => 'Center',
    ]),
]);

$settings->add([
    'name' => 'body_location_vertical',
    'label' => 'Body Location',
    'value' => $field->input('body_location_vertical', 'select', [
        '*above_feature' => 'Above Feature',
        'below_feature' => 'Below Feature',
    ]),
    'showIf' => 'image_location_horizontal=center',
]);

Tried searching to see if this has come up for anyone else but didn't see anything.