Description:
------------
This seems like some kind of an engine regression from 7.3. Staging system running 7.4.2 breaks, live system 7.3.13 works.

Code https://github.com/opencredit/badgeos/blob/1.4.11/includes/cmb/init.php#L380

Relevant code below:

```
/**
 * $field $field array (4)
 *
 *   ⇄name => string (18) "Upload Badge Image"
 *
 *   ⇄⧉desc => string (903) "<p>To set an image use the <strong>Achievement Image</strong> metabox to the...
 *
 *   ⇄id => string (39) "_badgeos_upload_badge_image_achievement"
 *
 *   ⇄type => string (9) "text_only"
 */

...
self::$field =& $field;

isset( $field['name'] ); // false. How??
```

Behavior changed when I loaded the same screen on another FPM pool that was running Xdebug - everything passed error free.

Behavior also changes if I replace reference with regular assignment, like `self::$field = $field` - this particular problem goes away, but other (probably unrelated) pieces in the chain now cough.

Your thoughts?