[Closed] Deepl - mapping of Traditional Chinese to Simplified Chinese doesn't work

public function get_languages_supported_by_automatic_translations( $languageCodes, $sourceLanguage = null ) {
				$sourceLanguage = $sourceLanguage ?: Languages::getDefaultCode();
    
				$lang_case_mapping = [
					'zh-hant' => 'zh-Hant',
				];
				$languageCodes = array_map(function($code) use ($lang_case_mapping){
					return isset($lang_case_mapping[$code]) ? $lang_case_mapping[$code] : $code; 
				}, $languageCodes);
    
				$result = $this->requestWithLog(
					$this->endpoints->getLanguagesCheckPairs(),
					[
						'method' => 'POST',
						'body'   => [
							[
								'source_language'  => $sourceLanguage,
								'target_languages' => $languageCodes,
							]
						]
					]
				);
    
				$revert_lang_code = function($obj) use ($lang_case_mapping) {
					$lang_case_mapping = array_flip($lang_case_mapping);
					foreach ($obj as $key => $value) {
						if (isset($lang_case_mapping[$key])) {
							$obj->{$lang_case_mapping[$key]} = $value;
							unset($obj->$key);
						}
					}
    
					return $obj;
				};
    
				return Maybe::of( $result )
				            ->reject( 'is_wp_error' )
				            ->map( Obj::prop( 'results' ) )
				            ->map( Lst::find( Relation::propEq( 'source_language', $sourceLanguage ) ) )
				            ->map( Obj::prop( 'target_languages' ) )
				            ->map( $revert_lang_code );
			}