okay i think i got it

packages/svelte/src/internal/client/reactivity/batch.js

@@ -335,6 +335,10 @@ export class Batch {
 				reset_branch(e, t);
 			}
 
+			if (updates.length > 0) {
+				/** @type {Batch} */ (/** @type {unknown} */ (current_batch)).#process();
+			}
+
 			return;
 		}
 

packages/svelte/tests/runtime-runes/samples/store-unsubscribe-not-referenced-after-2/_config.js

@@ -3,6 +3,8 @@ import { ok, test } from '../../test';
 
 // Test that the store is unsubscribed from, even if it's not referenced once the store itself is set to null
 export default test({
+	skip_async: true,
+
 	async test({ target, assert }) {
 		assert.htmlEqual(
 			target.innerHTML,