diff --git a/cocos/2d/assembler/label/ttfUtils.ts b/cocos/2d/assembler/label/ttfUtils.ts
index f30abef07d0..82a78d940db 100644
--- a/cocos/2d/assembler/label/ttfUtils.ts
+++ b/cocos/2d/assembler/label/ttfUtils.ts
@@ -92,6 +92,7 @@ const Alignment = [
 export const ttfUtils =  {
     getAssemblerData () {
         const sharedLabelData = Label._canvasPool.get();
+        sharedLabelData.canvas.width = sharedLabelData.canvas.height = 1;
         return sharedLabelData;
     },
 
diff --git a/cocos/2d/components/rich-text.ts b/cocos/2d/components/rich-text.ts
index 20345b28026..099f7e32531 100644
--- a/cocos/2d/components/rich-text.ts
+++ b/cocos/2d/components/rich-text.ts
@@ -483,6 +483,7 @@ export class RichText extends Component {
 
     public onLoad () {
         this.node.on(NodeEventType.LAYER_CHANGED, this._applyLayer, this);
+        this.node.on(NodeEventType.ANCHOR_CHANGED, this._updateRichTextPosition, this);
     }
 
     public onEnable () {
@@ -502,11 +503,6 @@ export class RichText extends Component {
         this._activateChildren(false);
     }
 
-    public start () {
-        this._onTTFLoaded();
-        this.node.on(NodeEventType.ANCHOR_CHANGED, this._updateRichTextPosition, this);
-    }
-
     public onRestore () {
         if (!EDITOR) {
             return;
@@ -1263,12 +1259,6 @@ export class RichText extends Component {
         label.lineHeight = this._lineHeight;
 
         label.updateRenderData(true);
-        // Todo: need update context size after this function call
-        // @ts-expect-error update assembler renderData for richText
-        const assembler = label._assembler;
-        if (assembler) {
-            assembler.updateRenderData(label);
-        }
     }
 
     protected _applyLayer () {