diff --git a/src/webgpu/listing_meta.json b/src/webgpu/listing_meta.json
index 352f16849f4a..5e4415b59506 100644
--- a/src/webgpu/listing_meta.json
+++ b/src/webgpu/listing_meta.json
@@ -1979,6 +1979,7 @@
   "webgpu:shader,validation,const_assert,const_assert:constant_expression_logical_or_no_assert:*": { "subcaseMS": 1.373 },
   "webgpu:shader,validation,const_assert,const_assert:constant_expression_no_assert:*": { "subcaseMS": 1.655 },
   "webgpu:shader,validation,const_assert,const_assert:evaluation_stage:*": { "subcaseMS": 3.367 },
+  "webgpu:shader,validation,decl,assignment_statement:vector_swizzle_assignment:*": { "subcaseMS": 84.344 },
   "webgpu:shader,validation,decl,compound_statement:decl_conflict:*": { "subcaseMS": 5.225 },
   "webgpu:shader,validation,decl,compound_statement:decl_use:*": { "subcaseMS": 0.625 },
   "webgpu:shader,validation,decl,const:assert:*": { "subcaseMS": 0.378 },
diff --git a/src/webgpu/shader/validation/decl/assignment_statement.spec.ts b/src/webgpu/shader/validation/decl/assignment_statement.spec.ts
index 2968bf46c428..29776e0a4daa 100644
--- a/src/webgpu/shader/validation/decl/assignment_statement.spec.ts
+++ b/src/webgpu/shader/validation/decl/assignment_statement.spec.ts
@@ -56,15 +56,15 @@ g.test('vector_indexed_assignment')
 const kSwizzleTests = {
   single: {
     src: 'v.x = 1.0',
-    pass: true,
+    pass: (t: ShaderValidationTest) => true,
   },
   multi: {
     src: 'v.xy = vec2(1.0, 2.0)',
-    pass: false,
+    pass: (t: ShaderValidationTest) => false || t.hasLanguageFeature('swizzle_assignment'),
   },
   swizzleswizzle: {
     src: 'v.xy.x = 1.0',
-    pass: false,
+    pass: (t: ShaderValidationTest) => false || t.hasLanguageFeature('swizzle_assignment'),
   },
 };
 
@@ -78,7 +78,7 @@ g.test('vector_swizzle_assignment')
         var v: vec4<f32> = vec4(0.0, 0.0, 0.0, 0.0);
         ${kSwizzleTests[t.params.case].src};
       }`;
-    t.expectCompileResult(kSwizzleTests[t.params.case].pass, wgsl);
+    t.expectCompileResult(kSwizzleTests[t.params.case].pass(t), wgsl);
   });
 
 g.test('compound_assignment_with_swizzle')