fix

Author: Rich-Harris

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

@@ -330,12 +330,22 @@ export class Batch {
 
 for (const batch of batches) {
 if (batch === this) {
-is_earlier = true;
+is_earlier = false;
 continue;
 }
 
-for (const source of this.current.keys()) {
-if (is_earlier && batch.current.has(source)) continue;
+for (const [source, value] of this.current) {
+if (batch.current.has(source)) {
+if (is_earlier) {
+// bring the value up to date
+batch.current.set(source, value);
+} else {
+// later batch has more recent value,
+// no need to re-run these effects
+continue;
+}
+}
+
 mark_effects(source);
 }