From cff865e3ed0c59a03987b8ce726237fda9482037 Mon Sep 17 00:00:00 2001
From: Simon Holthausen <simon.holthausen@vercel.com>
Date: Thu, 23 Oct 2025 17:15:55 +0200
Subject: [PATCH] fix

---
 packages/svelte/src/internal/client/reactivity/sources.js | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/packages/svelte/src/internal/client/reactivity/sources.js b/packages/svelte/src/internal/client/reactivity/sources.js
index 05d15b7cc8..2fe8c4f75d 100644
--- a/packages/svelte/src/internal/client/reactivity/sources.js
+++ b/packages/svelte/src/internal/client/reactivity/sources.js
@@ -332,9 +332,11 @@ function mark_reactions(signal, status) {
 			set_signal_status(reaction, status);
 		}
 
-		if ((flags & DERIVED) !== 0 && (flags & WAS_MARKED) === 0) {
-			reaction.f |= WAS_MARKED;
-			mark_reactions(/** @type {Derived} */ (reaction), MAYBE_DIRTY);
+		if ((flags & DERIVED) !== 0) {
+			if ((flags & WAS_MARKED) === 0) {
+				reaction.f |= WAS_MARKED;
+				mark_reactions(/** @type {Derived} */ (reaction), MAYBE_DIRTY);
+			}
 		} else if (not_dirty) {
 			if ((flags & BLOCK_EFFECT) !== 0) {
 				if (eager_block_effects !== null) {