diff --git a/src/backend/model/extension/ExtensionConfigWrapper.ts b/src/backend/model/extension/ExtensionConfigWrapper.ts
index d96e4bc7..ec24c3a9 100644
--- a/src/backend/model/extension/ExtensionConfigWrapper.ts
+++ b/src/backend/model/extension/ExtensionConfigWrapper.ts
@@ -22,9 +22,8 @@ export class ExtensionConfigWrapper {
       // make sure the config file exists by the time we load it.
       // TODO: remove this once typeconfig is fixed and can properly load defaults in arrays
       if (!fs.existsSync((pc.__options as ConfigClassOptions<ServerConfig>).configPath)) {
-        await pc.save();
+        await pc.load();
       }
-
       await pc.load(); // loading the basic configs, but we do not know the extension config hierarchy yet
 
       // TODO make sure that all extensions are present even after loading them from file
@@ -47,7 +46,7 @@ export class ExtensionConfigWrapper {
       // make sure the config file exists by the time we load it.
       // TODO: remove this once typeconfig is fixed and can properly load defaults in arrays
       if (!fs.existsSync((pc.__options as ConfigClassOptions<ServerConfig>).configPath)) {
-        pc.saveSync();
+        pc.loadSync();
       }
       pc.loadSync(); // loading the basic configs, but we do not know the extension config hierarchy yet
       // TODO make sure that all extensions are present even after loading them from file
diff --git a/src/common/config/private/PrivateConfigClass.ts b/src/common/config/private/PrivateConfigClass.ts
index f9d34834..d7386684 100644
--- a/src/common/config/private/PrivateConfigClass.ts
+++ b/src/common/config/private/PrivateConfigClass.ts
@@ -15,7 +15,7 @@ const isTesting = process.env['NODE_ENV'] == true || ['afterEach', 'after', 'bef
   .every((fn) => (global as any)[fn] instanceof Function);
 
 @ConfigClass<IConfigClass<TAGS> & ServerConfig>({
-  configPath: path.join(__dirname, !isTesting ? './../../../../config.json' : './../../../../test/backend/tmp/config.json'),
+  configPath: path.join(__dirname, !isTesting ? './../../../../config.json' : './../../../../test/tmp/config.json'),
   crateConfigPathIfNotExists: isTesting,
   saveIfNotExist: true,
   attachDescription: true,
diff --git a/test/common/unit/config/Config.ts b/test/common/unit/config/Config.ts
new file mode 100644
index 00000000..f288d02f
--- /dev/null
+++ b/test/common/unit/config/Config.ts
@@ -0,0 +1,25 @@
+import {expect} from 'chai';
+import {ConfigClassBuilder} from 'typeconfig/node';
+import {ExtensionConfigWrapper} from '../../../../src/backend/model/extension/ExtensionConfigWrapper';
+import {TestHelper} from '../../../TestHelper';
+import * as fs from 'fs';
+
+
+describe('Config', () => {
+  beforeEach(async () => {
+    await fs.promises.rm(TestHelper.TMP_DIR, {recursive: true, force: true});
+  });
+  afterEach(async () => {
+    await fs.promises.rm(TestHelper.TMP_DIR, {recursive: true, force: true});
+  });
+  it('should load default from env', () => {
+    process.env['default-Media-tempFolder'] = 'test/test';
+    const conf = ExtensionConfigWrapper.originalSync();
+    expect(conf.Media.tempFolder).to.be.equal('test/test');
+    expect(ConfigClassBuilder.attachPrivateInterface(conf.Media).__defaults.tempFolder).to.be.equal('test/test');
+    expect(process.env['default-Media-tempFolder']).to.be.equal('test/test');
+    const conf2 = ExtensionConfigWrapper.originalSync();
+    expect(ConfigClassBuilder.attachPrivateInterface(conf2.Media).__defaults.tempFolder).to.be.equal('test/test');
+    expect(conf2.Media.tempFolder).to.be.equal('test/test');
+  });
+});