diff --git a/.changeset/silent-rings-yell.md b/.changeset/silent-rings-yell.md
new file mode 100644
index 0000000000..0b417103f7
--- /dev/null
+++ b/.changeset/silent-rings-yell.md
@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+fix: don't reset status of uninitialized deriveds
diff --git a/packages/svelte/src/internal/client/runtime.js b/packages/svelte/src/internal/client/runtime.js
index 906d68fbf0..d9578142eb 100644
--- a/packages/svelte/src/internal/client/runtime.js
+++ b/packages/svelte/src/internal/client/runtime.js
@@ -399,7 +399,14 @@ function remove_reaction(signal, dependency) {
 			derived.f &= ~WAS_MARKED;
 		}
 
-		update_derived_status(derived);
+		// In a fork it's possible that a derived is executed and gets reactions, then commits, but is
+		// never re-executed. This is possible when the derived is only executed once in the context
+		// of a new branch which happens before fork.commit() runs. In this case, the derived still has
+		// UNINITIALIZED as its value, and then when it's loosing its reactions we need to ensure it stays
+		// DIRTY so it is reexecuted once someone wants its value again.
+		if (derived.v !== UNINITIALIZED) {
+			update_derived_status(derived);
+		}
 
 		// freeze any effects inside this derived
 		freeze_derived_effects(derived);
diff --git a/packages/svelte/tests/runtime-runes/samples/async-fork-if-derived/_config.js b/packages/svelte/tests/runtime-runes/samples/async-fork-if-derived/_config.js
new file mode 100644
index 0000000000..4a03a54e7a
--- /dev/null
+++ b/packages/svelte/tests/runtime-runes/samples/async-fork-if-derived/_config.js
@@ -0,0 +1,20 @@
+import { tick } from 'svelte';
+import { test } from '../../test';
+
+export default test({
+	async test({ assert, target }) {
+		const [, toggle] = target.querySelectorAll('button');
+
+		toggle?.click();
+		await tick();
+		assert.htmlEqual(target.innerHTML, `<button>0</button> <button>toggle</button> 0`);
+
+		toggle?.click();
+		await tick();
+		assert.htmlEqual(target.innerHTML, `<button>0</button> <button>toggle</button>`);
+
+		toggle?.click();
+		await tick();
+		assert.htmlEqual(target.innerHTML, `<button>0</button> <button>toggle</button> 0`);
+	}
+});
diff --git a/packages/svelte/tests/runtime-runes/samples/async-fork-if-derived/main.svelte b/packages/svelte/tests/runtime-runes/samples/async-fork-if-derived/main.svelte
new file mode 100644
index 0000000000..519857a9ce
--- /dev/null
+++ b/packages/svelte/tests/runtime-runes/samples/async-fork-if-derived/main.svelte
@@ -0,0 +1,13 @@
+<script>
+	import { fork } from 'svelte';
+	let show = $state(false);
+	let count = $state(0);
+	let d_count = $derived(count);
+</script>
+
+<button onclick={() => count += 1}>{count}</button> <!-- just here so count is compiled as a source -->
+<button onclick={() => fork(() => show = !show).commit()}>toggle</button>
+
+{#if show}
+	{d_count}
+{/if}