fix

packages/svelte/src/internal/client/dom/blocks/boundary.js

@@ -406,13 +406,6 @@ export class Fork {
 	 * @param {Source} source
 	 */
 	get(source) {
-		// console.log(
-		// 	'fork#get',
-		// 	[...this.changeset].map((s) => s.v),
-		// 	this.changeset.has(source),
-		// 	source.v
-		// );
-
 		if (this.changeset.has(source)) {
 			return source.v;
 		}

packages/svelte/src/internal/client/reactivity/deriveds.js

@@ -139,8 +139,6 @@ export function async_derived(fn, location) {
 						internal_set(signal, v);
 					}
 
-					active_fork?.changeset.add(signal);
-
 					if (DEV && location !== undefined) {
 						recent_async_deriveds.add(signal);
 

packages/svelte/src/internal/client/reactivity/sources.js

@@ -185,7 +185,9 @@ export function internal_set(source, value) {
 			}
 		}
 
-		if (!active_fork && !changeset.has(source)) {
+		if (active_fork !== null) {
+			active_fork.changeset.add(source);
+		} else {
 			changeset.add(source);
 		}
 

packages/svelte/src/internal/client/runtime.js

@@ -1060,14 +1060,18 @@ export function get(signal) {
 		recent_async_deriveds.delete(signal);
 	}
 
+	if ((signal.f & DERIVED) === 0) {
 		if (active_fork) {
+			// console.log('get from fork', (signal.f & DERIVED) !== 0 ? 'derived' : 'source', signal.v);
 			return active_fork.get(signal);
 		}
 
 		var boundary = active_effect?.b;
 		if (boundary) {
+			// console.log('get from boundary', (signal.f & DERIVED) !== 0 ? 'derived' : 'source', signal.v);
 			return boundary.get(signal);
 		}
+	}
 
 	return signal.v;
 }