fix

packages/svelte/src/internal/client/dom/blocks/boundary.js

@@ -171,7 +171,7 @@ export function boundary(node, props, children) {
 			for (var [signal, entry] of forks) {
 				if (signal.v !== entry.v) {
 					if ((signal.f & (DERIVED | ASYNC_DERIVED)) === 0) {
-						mark_reactions(signal, DIRTY, true);
+						mark_reactions(signal, DIRTY, undefined, true);
 						signal.wv = increment_write_version();
 					}
 				}

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

@@ -261,9 +261,10 @@ export function update_pre(source, d = 1) {
 /**
  * @param {Value} signal
  * @param {number} status should be DIRTY or MAYBE_DIRTY
+ * @param {Value} [parent]
  * @returns {void}
  */
-export function mark_reactions(signal, status, only_boundary = false) {
+export function mark_reactions(signal, status, parent, only_boundary = false) {
 	var reactions = signal.reactions;
 	if (reactions === null) return;
 
@@ -281,9 +282,10 @@ export function mark_reactions(signal, status, only_boundary = false) {
 		if (!runes && reaction === active_effect) continue;
 
 		if (only_boundary) {
+			var effect = /** @type {Effect} */ (reaction);
 			if ((flags & DERIVED) === 0) {
-				var boundary = get_boundary(/** @type {Effect} */ (reaction));
+				var boundary = get_boundary(effect);
-				if (!boundary || (reaction.f & ASYNC_DERIVED) !== 0) {
+				if (!boundary || ((reaction.f & ASYNC_DERIVED) !== 0 && !(signal.v instanceof Promise))) {
 					continue;
 				}
 			}
@@ -292,7 +294,7 @@ export function mark_reactions(signal, status, only_boundary = false) {
 			if (boundary) {
 				// @ts-ignore
 				var forks = boundary.fn.forks;
-				if (reaction.deps?.every((d) => forks.has(d))) {
+				if (reaction.deps?.every((d) => forks.has(d)) || forks.has(parent)) {
 					continue;
 				}
 			}
@@ -309,7 +311,7 @@ export function mark_reactions(signal, status, only_boundary = false) {
 		// If the signal a) was previously clean or b) is an unowned derived, then mark it
 		if ((flags & (CLEAN | UNOWNED)) !== 0) {
 			if ((flags & DERIVED) !== 0) {
-				mark_reactions(/** @type {Derived} */ (reaction), MAYBE_DIRTY, only_boundary);
+				mark_reactions(/** @type {Derived} */ (reaction), MAYBE_DIRTY, signal, only_boundary);
 			} else {
 				schedule_effect(/** @type {Effect} */ (reaction));
 			}

packages/svelte/tests/runtime-runes/samples/async-derived-module/_config.js

@@ -30,6 +30,7 @@ export default test({
 		await tick();
 		assert.htmlEqual(target.innerHTML, '<p>42</p>');
 
+		// This runs fine locally, but fails in CI by overfiring some effects?
 		component.num = 2;
 		await Promise.resolve();
 		await Promise.resolve();

packages/svelte/tests/runtime-runes/samples/async-derived/_config.js

@@ -28,6 +28,7 @@ export default test({
 		flushSync();
 		assert.htmlEqual(target.innerHTML, '<p>42</p>');
 
+		// This runs fine locally, but fails in CI by overfiring some effects?
 		component.num = 2;
 		await Promise.resolve();
 		await Promise.resolve();