Bug in W3 Object Cache

$test_key = “test_” . uniqid();

wp_cache_delete( $test_key, “test” );

$found = NULL;

$val = wp_cache_get( $test_key, “test”, false, $found );

var_dump($val);
var_dump($found);

The above test code placed into a template returns the following

bool(false)
bool(true)

Since the item being deleted never existed in the first place and since wp_cache_delete should be removing the item, shouldn’t $found be FALSE, on the call to wp_cache_get ?

This has caused significant issues with Advanced Custom Fields and seems like unexpected behaviour?