fix: on teardown, use the last known value for the signal before the se

Author: trueadm

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

@@ -15,7 +15,6 @@ import {
 	set_derived_sources,
 	check_dirtiness,
 	untracking,
-	old_values,
 	is_destroying_effect
 } from '../runtime.js';
 import { equals, safe_equals } from './equality.js';
@@ -36,6 +35,7 @@ import { get_stack } from '../dev/tracing.js';
 import { component_context, is_runes } from '../context.js';
 
 export let inspect_effects = new Set();
+export const old_values = new Map();
 
 /**
  * @param {Set<any>} v

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

@@ -25,7 +25,7 @@ import {
 	BOUNDARY_EFFECT
 } from './constants.js';
 import { flush_tasks } from './dom/task.js';
-import { internal_set } from './reactivity/sources.js';
+import { internal_set, old_values } from './reactivity/sources.js';
 import { destroy_derived_effects, update_derived } from './reactivity/deriveds.js';
 import * as e from './errors.js';
 import { FILENAME } from '../../constants.js';
@@ -40,8 +40,6 @@ import {
 } from './context.js';
 import { is_firefox } from './dom/operations.js';
 
-export const old_values = new Map();
-
 // Used for DEV time error handling
 /** @param {WeakSet<Error>} value */
 const handled_errors = new WeakSet();