diff --git a/packages/richtext-lexical/src/features/relationship/client/nodes/RelationshipNode.tsx b/packages/richtext-lexical/src/features/relationship/client/nodes/RelationshipNode.tsx
index 505c0a5d953..70d534682d1 100644
--- a/packages/richtext-lexical/src/features/relationship/client/nodes/RelationshipNode.tsx
+++ b/packages/richtext-lexical/src/features/relationship/client/nodes/RelationshipNode.tsx
@@ -22,10 +22,13 @@ const RelationshipComponent = React.lazy(() =>
 )
 
 function $relationshipElementToNode(domNode: HTMLDivElement): DOMConversionOutput | null {
-  const id = domNode.getAttribute('data-lexical-relationship-id')
+  let id: null | number | string = domNode.getAttribute('data-lexical-relationship-id')
   const relationTo = domNode.getAttribute('data-lexical-relationship-relationTo')
 
   if (id != null && relationTo != null) {
+    if (String(Number(id)) === id) {
+      id = Number(id)
+    }
     const node = $createRelationshipNode({
       relationTo,
       value: id,
diff --git a/packages/richtext-lexical/src/features/relationship/server/nodes/RelationshipNode.tsx b/packages/richtext-lexical/src/features/relationship/server/nodes/RelationshipNode.tsx
index 24079acc357..d728a3b1f89 100644
--- a/packages/richtext-lexical/src/features/relationship/server/nodes/RelationshipNode.tsx
+++ b/packages/richtext-lexical/src/features/relationship/server/nodes/RelationshipNode.tsx
@@ -17,10 +17,13 @@ import {
 import type { RelationshipData, SerializedRelationshipNode } from '../schema.js'
 
 function $relationshipElementToServerNode(domNode: HTMLDivElement): DOMConversionOutput | null {
-  const id = domNode.getAttribute('data-lexical-relationship-id')
+  let id: null | number | string = domNode.getAttribute('data-lexical-relationship-id')
   const relationTo = domNode.getAttribute('data-lexical-relationship-relationTo')
 
   if (id != null && relationTo != null) {
+    if (String(Number(id)) === id) {
+      id = Number(id)
+    }
     const node = $createServerRelationshipNode({
       relationTo,
       value: id,
diff --git a/packages/richtext-lexical/src/features/upload/server/nodes/conversions.ts b/packages/richtext-lexical/src/features/upload/server/nodes/conversions.ts
index f0cb83e04ff..aac383f5790 100644
--- a/packages/richtext-lexical/src/features/upload/server/nodes/conversions.ts
+++ b/packages/richtext-lexical/src/features/upload/server/nodes/conversions.ts
@@ -40,10 +40,13 @@ export function $convertUploadElement(
     domNode.hasAttribute('data-lexical-upload-relation-to') &&
     domNode.hasAttribute('data-lexical-upload-id')
   ) {
-    const id = domNode.getAttribute('data-lexical-upload-id')
+    let id: null | number | string = domNode.getAttribute('data-lexical-upload-id')
     const relationTo = domNode.getAttribute('data-lexical-upload-relation-to')
 
     if (id != null && relationTo != null) {
+      if (String(Number(id)) === id) {
+        id = Number(id)
+      }
       const node = $createNode({
         data: {
           fields: {},