all non-unit tests passing

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

@@ -369,11 +369,7 @@ export function update_derived(derived) {
 	if (batch_values !== null) {
 		batch_values.set(derived, derived.v);
 	} else {
-		var status =
+		var status = (derived.f & CONNECTED) === 0 ? MAYBE_DIRTY : CLEAN;
-			(skip_reaction || (derived.f & CONNECTED) === 0) && derived.deps !== null
-				? MAYBE_DIRTY
-				: CLEAN;
-
 		set_signal_status(derived, status);
 	}
 }

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

@@ -32,7 +32,8 @@ import {
 	EFFECT_PRESERVED,
 	STALE_REACTION,
 	USER_EFFECT,
-	ASYNC
+	ASYNC,
+	CONNECTED
 } from '#client/constants';
 import * as e from '../errors.js';
 import { DEV } from 'esm-env';
@@ -102,7 +103,7 @@ function create_effect(type, fn, sync, push = true) {
 		deps: null,
 		nodes_start: null,
 		nodes_end: null,
-		f: type | DIRTY,
+		f: type | DIRTY | CONNECTED,
 		first: null,
 		fn,
 		last: null,

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

@@ -272,7 +272,7 @@ export function update_reaction(reaction) {
 				reaction.deps = deps = new_deps;
 			}
 
-			if (is_updating_effect) {
+			if (is_updating_effect && (reaction.f & CONNECTED) !== 0) {
 				for (i = skipped_deps; i < deps.length; i++) {
 					(deps[i].reactions ??= []).push(reaction);
 				}
@@ -626,6 +626,15 @@ export function get(signal) {
 		if (is_dirty(derived)) {
 			update_derived(derived);
 		}
+
+		// reconnect a disconnected derived to the graph
+		if (is_updating_effect && (derived.f & CONNECTED) === 0 && derived.deps !== null) {
+			derived.f |= CONNECTED;
+
+			for (const dep of derived.deps) {
+				(dep.reactions ??= []).push(derived);
+			}
+		}
 	}
 
 	if (batch_values?.has(signal)) {