Merge pull request #7324 from opf/fix/shallow-copy

Use shallow copy in changeset

[ci skip]

frontend/src/app/components/wp-edit-form/work-package-changeset.ts

@@ -386,7 +386,7 @@ export class WorkPackageChangeset {
       return;
     }
 
-    let payload:any = this.workPackage.$plain();
+    let payload:any = { ... this.workPackage.$source };
 
     const resource = this.halResourceService.createHalResourceOfType('WorkPackage', this.mergeWithPayload(payload));