fix tests

packages/svelte/src/compiler/phases/3-transform/client/transform-client.js

@@ -256,7 +256,7 @@ export function client_component(source, analysis, options) {
 
 			properties.push(
 				b.get(key, [b.return(b.call(b.id(name)))]),
-				b.set(key, [b.stmt(b.call(b.id(name), b.id('$$value')))])
+				b.set(key, [b.stmt(b.call(b.id(name), b.id('$$value'))), b.stmt(b.call('$.flushSync'))])
 			);
 		}
 	}

packages/svelte/tests/runtime-legacy/samples/dynamic-component-dirty/_config.js

@@ -1,7 +1,7 @@
 import { test } from '../../test';
 
 /** @type {string[]} */
-const calls = [];
+let calls = [];
 
 export default test({
 	get props() {
@@ -9,7 +9,7 @@ export default test({
 	},
 
 	before_test() {
-		calls.length = 0;
+		calls = [];
 	},
 
 	async test({ assert, component, target, window }) {