diff --git a/examples/jsm/tsl/display/TRAAPassNode.js b/examples/jsm/tsl/display/TRAAPassNode.js
index 97163d84c68d5b..7c94fc2e2d5cdf 100644
--- a/examples/jsm/tsl/display/TRAAPassNode.js
+++ b/examples/jsm/tsl/display/TRAAPassNode.js
@@ -140,6 +140,7 @@ class TRAAPassNode extends PassNode {
 		renderer.clear();
 		renderer.render( scene, camera );
 
+		renderer.setRenderTarget( null );
 		renderer.setMRT( null );
 
 		// every time when the dimensions change we need fresh history data. Copy the sample
@@ -154,6 +155,11 @@ class TRAAPassNode extends PassNode {
 			renderer.setRenderTarget( this._historyRenderTarget );
 			renderer.clear();
 
+			renderer.setRenderTarget( this.renderTarget );
+			renderer.clear();
+
+			renderer.setRenderTarget( null );
+
 			renderer.copyTextureToTexture( this._sampleRenderTarget.texture, this._historyRenderTarget.texture );
 			renderer.copyTextureToTexture( this._sampleRenderTarget.texture, this.renderTarget.texture );
 
@@ -164,6 +170,7 @@ class TRAAPassNode extends PassNode {
 			renderer.setRenderTarget( this.renderTarget );
 			_quadMesh.material = this._resolveMaterial;
 			_quadMesh.render( renderer );
+			renderer.setRenderTarget( null );
 
 			// update history
 
diff --git a/examples/webgpu_postprocessing_traa.html b/examples/webgpu_postprocessing_traa.html
index da75fab26c751c..e6f01a5ec8c9d6 100644
--- a/examples/webgpu_postprocessing_traa.html
+++ b/examples/webgpu_postprocessing_traa.html
@@ -26,7 +26,6 @@
 			import * as THREE from 'three';
 			import { mrt, output, velocity } from 'three/tsl';
 			import { traaPass } from 'three/addons/tsl/display/TRAAPassNode.js';
-			import WebGPU from 'three/addons/capabilities/WebGPU.js';
 
 			import Stats from 'three/addons/libs/stats.module.js';
 
@@ -38,15 +37,7 @@
 
 			function init() {
 
-				if ( WebGPU.isAvailable() === false ) {
-
-					document.body.appendChild( WebGPU.getErrorMessage() );
-
-					throw new Error( 'No WebGPU support' );
-
-				}
-
-				renderer = new THREE.WebGPURenderer();
+				renderer = new THREE.WebGPURenderer( { forceWebGL: true } );
 				renderer.setPixelRatio( window.devicePixelRatio );
 				renderer.setSize( window.innerWidth, window.innerHeight );
 				renderer.setAnimationLoop( animate );
diff --git a/src/renderers/webgl-fallback/WebGLBackend.js b/src/renderers/webgl-fallback/WebGLBackend.js
index c37dd751ff6cbb..b8003f6eac9095 100644
--- a/src/renderers/webgl-fallback/WebGLBackend.js
+++ b/src/renderers/webgl-fallback/WebGLBackend.js
@@ -1281,9 +1281,9 @@ class WebGLBackend extends Backend {
 
 	}
 
-	copyTextureToTexture( position, srcTexture, dstTexture, level ) {
+	copyTextureToTexture( srcTexture, dstTexture, srcRegion, dstPosition, level ) {
 
-		this.textureUtils.copyTextureToTexture( position, srcTexture, dstTexture, level );
+		this.textureUtils.copyTextureToTexture( srcTexture, dstTexture, srcRegion, dstPosition, level );
 
 	}
 
@@ -1355,6 +1355,7 @@ class WebGLBackend extends Backend {
 						const texture = textures[ i ];
 						const textureData = this.get( texture );
 						textureData.renderTarget = descriptor.renderTarget;
+						textureData.cacheKey = cacheKey; // required for copyTextureToTexture()
 
 						const attachment = gl.COLOR_ATTACHMENT0 + i;
 
@@ -1370,6 +1371,8 @@ class WebGLBackend extends Backend {
 
 					const textureData = this.get( descriptor.depthTexture );
 					const depthStyle = stencilBuffer ? gl.DEPTH_STENCIL_ATTACHMENT : gl.DEPTH_ATTACHMENT;
+					textureData.renderTarget = descriptor.renderTarget;
+					textureData.cacheKey = cacheKey; // required for copyTextureToTexture()
 
 					gl.framebufferTexture2D( gl.FRAMEBUFFER, depthStyle, gl.TEXTURE_2D, textureData.textureGPU, 0 );
 
diff --git a/src/renderers/webgl-fallback/utils/WebGLTextureUtils.js b/src/renderers/webgl-fallback/utils/WebGLTextureUtils.js
index cd58e2e1fc4024..94012f3b4609e7 100644
--- a/src/renderers/webgl-fallback/utils/WebGLTextureUtils.js
+++ b/src/renderers/webgl-fallback/utils/WebGLTextureUtils.js
@@ -659,20 +659,46 @@ class WebGLTextureUtils {
 		gl.pixelStorei( gl.UNPACK_SKIP_PIXELS, minX );
 		gl.pixelStorei( gl.UNPACK_SKIP_ROWS, minY );
 
+		if ( srcTexture.isRenderTargetTexture || srcTexture.isDepthTexture ) {
 
-		if ( srcTexture.isDataTexture ) {
+			const srcTextureData = backend.get( srcTexture );
+			const dstTextureData = backend.get( dstTexture );
 
-			gl.texSubImage2D( gl.TEXTURE_2D, level, dstX, dstY, width, height, glFormat, glType, image.data );
+			const srcRenderContextData = backend.get( srcTextureData.renderTarget );
+			const dstRenderContextData = backend.get( dstTextureData.renderTarget );
+
+			const srcFramebuffer = srcRenderContextData.framebuffers[ srcTextureData.cacheKey ];
+			const dstFramebuffer = dstRenderContextData.framebuffers[ dstTextureData.cacheKey ];
+
+			state.bindFramebuffer( gl.READ_FRAMEBUFFER, srcFramebuffer );
+			state.bindFramebuffer( gl.DRAW_FRAMEBUFFER, dstFramebuffer );
+
+			let mask = gl.COLOR_BUFFER_BIT;
+
+			if ( srcTexture.isDepthTexture ) mask = gl.DEPTH_BUFFER_BIT;
+
+			gl.blitFramebuffer( minX, minY, width, height, dstX, dstY, width, height, mask, gl.NEAREST );
+
+			state.bindFramebuffer( gl.READ_FRAMEBUFFER, null );
+			state.bindFramebuffer( gl.DRAW_FRAMEBUFFER, null );
 
 		} else {
 
-			if ( srcTexture.isCompressedTexture ) {
+			if ( srcTexture.isDataTexture ) {
 
-				gl.compressedTexSubImage2D( gl.TEXTURE_2D, level, dstX, dstY, image.width, image.height, glFormat, image.data );
+				gl.texSubImage2D( gl.TEXTURE_2D, level, dstX, dstY, width, height, glFormat, glType, image.data );
 
 			} else {
 
-				gl.texSubImage2D( gl.TEXTURE_2D, level, dstX, dstY, width, height, glFormat, glType, image );
+				if ( srcTexture.isCompressedTexture ) {
+
+					gl.compressedTexSubImage2D( gl.TEXTURE_2D, level, dstX, dstY, image.width, image.height, glFormat, image.data );
+
+				} else {
+
+					gl.texSubImage2D( gl.TEXTURE_2D, level, dstX, dstY, width, height, glFormat, glType, image );
+
+				}
 
 			}