Enable new api by default. https://github.com/Koenkk/zigbee2mqtt/issues/3281

lib/util/utils.js

@@ -174,6 +174,7 @@ function* getExternalConvertersDefinitions(settings) {
 
 function toSnakeCase(value) {
     if (typeof value === 'object') {
+        value = {...value};
         for (const key of Object.keys(value)) {
             const keySnakeCase = toSnakeCase(key);
             if (key !== keySnakeCase) {