tweak

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

@@ -52,11 +52,9 @@ export class Batch {
 		}
 
 		for (const e of this.effects) {
-			if (e.fn) {
 			set_signal_status(e, DIRTY);
 			schedule_effect(e);
 		}
-		}
 
 		for (const batch of batches) {
 			if (batch === this) continue;

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

@@ -852,7 +852,7 @@ function process_effects(root, async_effects, render_effects, effects) {
 
 		var skip = is_skippable_branch || (flags & INERT) !== 0 || batch.skipped_effects.has(effect);
 
-		if (!skip) {
+		if (!skip && effect.fn !== null) {
 			if ((flags & EFFECT_ASYNC) !== 0) {
 				if (check_dirtiness(effect)) {
 					async_effects.push(effect);