gate on non-async mode

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

@@ -217,7 +217,7 @@ function schedule_possible_effect_self_invalidation(batch, signal, effect) {
 	var reactions = signal.reactions;
 	if (reactions === null) return;
 
-	if (!async_mode_flag && current_sources !== null && includes.call(current_sources, signal)) {
+	if (current_sources !== null && includes.call(current_sources, signal)) {
 		return;
 	}
 
@@ -304,6 +304,7 @@ export function update_reaction(reaction) {
 		// ensure that if any of those untracked writes result in re-invalidation
 		// of the current effect, then that happens accordingly
 		if (
+			!async_mode_flag &&
 			is_runes() &&
 			untracked_writes !== null &&
 			!untracking &&