From ffded128e918ca43a3cf9d33746dba7b88b186d2 Mon Sep 17 00:00:00 2001
From: Simon Holthausen <simon.holthausen@vercel.com>
Date: Tue, 17 Jun 2025 22:48:23 +0200
Subject: [PATCH] fix

---
 .../svelte/src/internal/client/dom/elements/attributes.js     | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/packages/svelte/src/internal/client/dom/elements/attributes.js b/packages/svelte/src/internal/client/dom/elements/attributes.js
index b33b403e75..a663450b4a 100644
--- a/packages/svelte/src/internal/client/dom/elements/attributes.js
+++ b/packages/svelte/src/internal/client/dom/elements/attributes.js
@@ -495,12 +495,14 @@ export function attribute_effect(
 		}
 
 		for (let symbol of Object.getOwnPropertySymbols(next)) {
-			var n = (current[symbol] = next[symbol]);
+			var n = next[symbol];
 
 			if (symbol.description === ATTACHMENT_KEY && (!prev || n !== prev[symbol])) {
 				if (effects[symbol]) destroy_effect(effects[symbol]);
 				effects[symbol] = branch(() => attach(element, () => n));
 			}
+
+			current[symbol] = n;
 		}
 
 		prev = current;