diff --git a/public/workers/message_packet_worker.js b/public/workers/message_packet_worker.js
index 6ff04cf..7bdf791 100644
--- a/public/workers/message_packet_worker.js
+++ b/public/workers/message_packet_worker.js
@@ -64,14 +64,26 @@ function GetCircularReplacerKeepDataStructure()
     }
 
     if (key === 'containers') {
-      return Object.fromEntries(value);
+      return [...value.entries()].map((keyPair) => {
+        return {
+          Key: keyPair[0],
+          Value: keyPair[1]
+        };
+      });
     }
 
     if (key === 'symbols') {
-      return Object.fromEntries(value);
+      return [...value.entries()].map((keyPair) => {
+        return {
+          Key: keyPair[0],
+          Value: keyPair[1]
+        };
+      });
     }
 
-    return value;
+    if (key === 'linkedContainers') {
+      return Array.from(value);
+    }
   };
 }
 
diff --git a/public/workers/message_worker.js b/public/workers/message_worker.js
index ac02d3b..a5399f0 100644
--- a/public/workers/message_worker.js
+++ b/public/workers/message_worker.js
@@ -34,14 +34,26 @@ function GetCircularReplacerKeepDataStructure()
     }
 
     if (key === 'containers') {
-      return Object.fromEntries(value);
+      return [...value.entries()].map((keyPair) => {
+        return {
+          Key: keyPair[0],
+          Value: keyPair[1]
+        };
+      });
     }
 
     if (key === 'symbols') {
-      return Object.fromEntries(value);
+      return [...value.entries()].map((keyPair) => {
+        return {
+          Key: keyPair[0],
+          Value: keyPair[1]
+        };
+      });
     }
 
-    return value;
+    if (key === 'linkedContainers') {
+      return Array.from(value);
+    }
   };
 }
 
diff --git a/src/Components/API/api.ts b/src/Components/API/api.ts
index 09ec2e1..e011c48 100644
--- a/src/Components/API/api.ts
+++ b/src/Components/API/api.ts
@@ -2,7 +2,7 @@ import { API_FETCH_URL, API_SET_CONTAINER_LIST_URL } from '../../../public/svgld
 import { IConfiguration } from '../../Interfaces/IConfiguration';
 import { ISetContainerListRequest } from '../../Interfaces/ISetContainerListRequest';
 import { ISetContainerListResponse } from '../../Interfaces/ISetContainerListResponse';
-import { GetCircularReplacerKeepDataStructure } from '../../utils/saveload';
+import { GetCircularReplacerToDotnet } from '../../utils/saveload';
 
 /**
  * Fetch the configuration from the API
@@ -36,7 +36,7 @@ export async function FetchConfiguration(): Promise<IConfiguration> {
 
 export async function SetContainerList(request: ISetContainerListRequest): Promise<ISetContainerListResponse> {
   const url = API_SET_CONTAINER_LIST_URL;
-  const dataParsed = JSON.stringify(request, GetCircularReplacerKeepDataStructure());
+  const dataParsed = JSON.stringify(request, GetCircularReplacerToDotnet());
   // The test library cannot use the Fetch API
   // @ts-expect-error
   // eslint-disable-next-line @typescript-eslint/strict-boolean-expressions
diff --git a/src/Components/Messages/Messages.tsx b/src/Components/Messages/Messages.tsx
index 139a123..9e04670 100644
--- a/src/Components/Messages/Messages.tsx
+++ b/src/Components/Messages/Messages.tsx
@@ -5,7 +5,7 @@ import { MessageType } from '../../Enums/MessageType';
 import { IHistoryState } from '../../Interfaces/IHistoryState';
 import { IMessage } from '../../Interfaces/IMessage';
 import { DISABLE_API } from '../../utils/default';
-import { GetCircularReplacerKeepDataStructure } from '../../utils/saveload';
+import { GetCircularReplacerToDotnet } from '../../utils/saveload';
 import { TITLE_BAR_HEIGHT } from '../Sidebar/Sidebar';
 
 interface IMessagesProps {
diff --git a/src/Components/UI/UseWorker.tsx b/src/Components/UI/UseWorker.tsx
index 7f8a904..ed6b8e2 100644
--- a/src/Components/UI/UseWorker.tsx
+++ b/src/Components/UI/UseWorker.tsx
@@ -3,7 +3,7 @@ import { IHistoryState } from '../../Interfaces/IHistoryState';
 import { IGetFeedbackRequest } from '../../Interfaces/IGetFeedbackRequest';
 import { IGetFeedbackResponse } from '../../Interfaces/IGetFeedbackResponse';
 import { IMessage } from '../../Interfaces/IMessage';
-import { GetCircularReplacerKeepDataStructure } from '../../utils/saveload';
+import { GetCircularReplacerToDotnet } from '../../utils/saveload';
 import { API_GET_FEEDBACK_URL } from '../../../public/svgld-settings';
 
 // eslint-disable-next-line @typescript-eslint/strict-boolean-expressions
@@ -37,7 +37,7 @@ export function UseAsync(
       // eslint-disable-next-line @typescript-eslint/naming-convention
       ApplicationState: state
     };
-    const dataParsed = JSON.stringify(request, GetCircularReplacerKeepDataStructure());
+    const dataParsed = JSON.stringify(request, GetCircularReplacerToDotnet());
     fetch(API_GET_FEEDBACK_URL, {
       method: 'POST',
       headers: new Headers({
diff --git a/src/main.tsx b/src/main.tsx
index 21c0771..58b8818 100644
--- a/src/main.tsx
+++ b/src/main.tsx
@@ -16,6 +16,9 @@ function RenderRoot(root: Element | Document): void {
 namespace SVGLayoutDesigner {
   // eslint-disable-next-line @typescript-eslint/naming-convention
   export const Render = RenderRoot;
+  export const API_FETCH_URL = 'http://localhost:5000';
+  export const API_SET_CONTAINER_LIST_URL = 'http://localhost:5000/SetContainerList';
+  export const API_GET_FEEDBACK_URL = 'http://localhost:5000/GetFeedback';
 }
 
 (window as any).SVGLayoutDesigner = SVGLayoutDesigner;
diff --git a/src/utils/saveload.ts b/src/utils/saveload.ts
index abdbbd1..7250500 100644
--- a/src/utils/saveload.ts
+++ b/src/utils/saveload.ts
@@ -77,18 +77,32 @@ export function GetCircularReplacer(): (key: any, value: object | Map<string, an
   };
 }
 
-export function GetCircularReplacerKeepDataStructure(): (key: any, value: object | Map<string, any> | null) => object | null | undefined {
+export function GetCircularReplacerToDotnet(): (key: any, value: object | Map<string, any> | null) => object | null | undefined {
   return (key: any, value: object | null) => {
     if (key === 'parent') {
       return;
     }
 
     if (key === 'containers') {
-      return Object.fromEntries(value as Map<string, any>);
+      return [...(value as Map<string, any>).entries()].map((keyPair: [string, any]) => {
+        return {
+          Key: keyPair[0],
+          Value: keyPair[1]
+        };
+      });
     }
 
     if (key === 'symbols') {
-      return Object.fromEntries((value as Map<string, any>));
+      return [...(value as Map<string, any>).entries()].map((keyPair: [string, any]) => {
+        return {
+          Key: keyPair[0],
+          Value: keyPair[1]
+        };
+      });
+    }
+
+    if (key === 'linkedContainers') {
+      return Array.from(value as Set<string>);
     }
 
     return value;