restore the batch id check in BranchManager#commit and carry blocking_pending through #merge

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

@@ -110,14 +110,16 @@ export class BranchManager {
 			}
 		}
 
-		for (const [b, k] of this.#batches) {
-			this.#batches.delete(b);
+		this.#batches.delete(batch);
 
-			if (b === batch) {
+		for (const [b, k] of this.#batches) {
+			if (b.id > batch.id) {
 				// keep values for newer batches
-				break;
+				continue;
 			}
 
+			this.#batches.delete(b);
+
 			const offscreen = this.#offscreen.get(k);
 
 			if (offscreen) {

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

@@ -621,6 +621,12 @@ export class Batch {
 		}
 
 		this.#pending += batch.#pending;
+		if (batch.#blocking_pending !== null) {
+			const blocking_pending = (this.#blocking_pending ??= new Map());
+			for (const [effect, count] of batch.#blocking_pending) {
+				blocking_pending.set(effect, (blocking_pending.get(effect) ?? 0) + count);
+			}
+		}
 
 		for (const c of batch.#commit_callbacks) {
 			this.oncommit(() => c(batch));