From 3a45c49b79eb3c9f9a5fea3ca42de91bea6016db Mon Sep 17 00:00:00 2001
From: Rich Harris <rich.harris@vercel.com>
Date: Thu, 21 May 2026 10:49:06 -0400
Subject: [PATCH] fix

---
 packages/svelte/src/internal/client/reactivity/batch.js | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/packages/svelte/src/internal/client/reactivity/batch.js b/packages/svelte/src/internal/client/reactivity/batch.js
index 895b752ed8..e3cb4abf9d 100644
--- a/packages/svelte/src/internal/client/reactivity/batch.js
+++ b/packages/svelte/src/internal/client/reactivity/batch.js
@@ -530,7 +530,10 @@ export class Batch {
 					var effect = /** @type {Effect} */ (reaction);
 
 					if (flags & (ASYNC | BLOCK_EFFECT) && !this.async_deriveds.has(effect)) {
-						effect.f ^= ~CLEAN;
+						if ((effect.f & CLEAN) !== 0) {
+							effect.f ^= CLEAN;
+						}
+
 						this.schedule(effect);
 					}
 				}