fix issue

Author: trueadm

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

@@ -117,6 +117,7 @@ export function update_derived(derived, force_schedule) {
  */
 export function destroy_derived(signal) {
 	destroy_derived_children(signal);
+	destroy_effect_children(signal);
 	remove_reactions(signal, 0);
 	set_signal_status(signal, DESTROYED);
 

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

@@ -93,8 +93,16 @@ function create_effect(type, fn, sync) {
 	}
 
 	if (current_reaction !== null && !is_root) {
-		if ((current_reaction.f & (DERIVED | UNOWNED)) === (DERIVED | UNOWNED)) {
-			e.effect_in_unowned_derived();
+		var flags = current_reaction.f;
+		if ((flags & DERIVED) !== 0) {
+			if ((flags & UNOWNED) !== 0) {
+				e.effect_in_unowned_derived();
+			}
+			// If we are inside a derived, then we also need to attach the
+			// effect to the parent effect too.
+			if (current_effect !== null) {
+				push_effect(effect, current_effect);
+			}
 		}
 
 		push_effect(effect, current_reaction);