Method IdentitiesGenerator::generateIdentitiesCacheKey return always the string 'Transient'
$identityId = 'test-identity-id';
$traits = (object) ['key' => 'value'];
$cacheKey = IdentitiesGenerator::generateIdentitiesCacheKey($identityId, $traits, null);
// $cacheKey: 'Transient'
$cacheKeyTransient = IdentitiesGenerator::generateIdentitiesCacheKey($identityId, $traits, true);
// $cacheKeyTransient: 'Transient'