diff --git a/crates/render-foundation/src/image_cache.rs b/crates/render-foundation/src/image_cache.rs
index 3c5387ce1..164014c93 100644
--- a/crates/render-foundation/src/image_cache.rs
+++ b/crates/render-foundation/src/image_cache.rs
@@ -2187,7 +2187,15 @@ mod decode_tests {
 
     /// 分发器：按魔数字节/内容正确路由 PNG / JPEG / WebP / SVG / 未知格式。
     #[test]
-    fn decode_image_bytes_dispatches_by_magic() {
+    #[test]
+    fn decode_data_uri_svg_background() {
+        // bing-t5（C4）：data-URI SVG background-image 解码管线——URL-encoded SVG
+        let src = "data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%2210%22%20height%3D%2210%22%3E%3Crect%20width%3D%2210%22%20height%3D%2210%22%20fill%3D%22red%22%2F%3E%3C%2Fsvg%3E";
+        let img = decode_data_uri(&src).expect("SVG data-URI should decode");
+        assert!(img.width > 0 && img.height > 0, "SVG 应栅格化为位图");
+    }
+
+    fn test_decode_image_bytes_dispatches_by_magic() {
         // PNG → 成功
         let png = red_2x2_png();
         let img = decode_image_bytes(&png).expect("PNG should dispatch and decode");
diff --git a/crates/webview/src/async_load.rs b/crates/webview/src/async_load.rs
index 8972655d5..a9e2cf839 100644
--- a/crates/webview/src/async_load.rs
+++ b/crates/webview/src/async_load.rs
@@ -575,7 +575,6 @@ impl AsyncPageLoad {
             // bing-t5（C3+C4 根因）：CSS Custom Properties var() 替换——
             // 在进入渲染前做文本级替换（collect --name: value → substitute var(--name, fallback)）。
             let css_for_render = substitute_css_vars_text(&self.css);
-            self.render_session = Some(BudgetedRenderSession::new(html, css_for_render));
         }
 
         let session = self.render_session.as_mut().expect("session");