fix

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

@@ -61,9 +61,7 @@ export function await_block(node, get_input, pending_fn, then_fn, catch_fn) {
 	var input_source = runes
 		? source(/** @type {V} */ (undefined))
 		: mutable_source(/** @type {V} */ (undefined), false, false);
-	var error_source = runes
-		? source(/** @type {V} */ (undefined))
-		: mutable_source(/** @type {V} */ (undefined), false, false);
+	var error_source = runes ? source(undefined) : mutable_source(undefined, false, false);
 	var resolved = false;
 
 	/**

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

@@ -101,7 +101,7 @@ export function mutable_source(initial_value, immutable = false, trackable = tru
 
 	// bind the signal to the component context, in case we need to
 	// track updates to trigger beforeUpdate/afterUpdate callbacks
-	if (trackable && legacy_mode_flag && component_context !== null && component_context.l !== null) {
+	if (legacy_mode_flag && trackable && component_context !== null && component_context.l !== null) {
 		(component_context.l.s ??= []).push(s);
 	}