From 2620a2189fbcc11565bc69b59dfa4b3896c3003a Mon Sep 17 00:00:00 2001
From: Rich Harris <rich.harris@vercel.com>
Date: Sat, 19 Apr 2025 13:16:53 -0400
Subject: [PATCH] tweak

---
 .../src/internal/client/dom/blocks/boundary.js     |  4 ++++
 .../src/internal/client/reactivity/deriveds.js     | 14 +++++++-------
 2 files changed, 11 insertions(+), 7 deletions(-)

diff --git a/packages/svelte/src/internal/client/dom/blocks/boundary.js b/packages/svelte/src/internal/client/dom/blocks/boundary.js
index 1738a27ff2..a71f604707 100644
--- a/packages/svelte/src/internal/client/dom/blocks/boundary.js
+++ b/packages/svelte/src/internal/client/dom/blocks/boundary.js
@@ -228,6 +228,8 @@ export class Boundary {
 				});
 			}
 
+			this.ran = false;
+
 			this.#main_effect = this.#run(() => {
 				this.#is_creating_fallback = false;
 
@@ -238,6 +240,8 @@ export class Boundary {
 				}
 			});
 
+			this.ran = true;
+
 			if (this.#pending_count > 0) {
 				this.#show_pending_snippet();
 			}
diff --git a/packages/svelte/src/internal/client/reactivity/deriveds.js b/packages/svelte/src/internal/client/reactivity/deriveds.js
index 17f41d856f..6b2ea3d39b 100644
--- a/packages/svelte/src/internal/client/reactivity/deriveds.js
+++ b/packages/svelte/src/internal/client/reactivity/deriveds.js
@@ -124,13 +124,13 @@ export function async_derived(fn, location) {
 		var restore = capture();
 
 		var fork = active_fork;
+		var ran = boundary.ran;
 
 		if (should_suspend) {
-			if (fork !== null) {
-				fork.increment();
-			} else {
-				// if nearest pending boundary is not ready, attach to the boundary
+			if (!ran) {
 				boundary.increment();
+			} else {
+				fork?.increment();
 			}
 		}
 
@@ -144,10 +144,10 @@ export function async_derived(fn, location) {
 				from_async_derived = null;
 
 				if (should_suspend) {
-					if (fork !== null) {
-						fork.decrement();
-					} else {
+					if (!ran) {
 						boundary.decrement();
+					} else {
+						fork?.decrement();
 					}
 				}