WIP

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

@@ -246,8 +246,11 @@ export class Boundary {
 
 			if (this.#pending_count > 0) {
 				var fragment = document.createDocumentFragment();
+				var anchor = create_text();
+				fragment.append(anchor);
+
 				this.#offscreen_effect = this.#main_effect;
-				move_effect(this.#main_effect, fragment);
+				move_effect_before(this.#offscreen_effect, anchor);
 
 				const pending = /** @type {(anchor: Node) => void} */ (this.#props.pending);
 				this.#pending_effect = branch(() => pending(this.#anchor));

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

@@ -114,8 +114,6 @@ export class BranchManager {
 
 				if (keys.includes(k)) {
 					// keep the effect offscreen, as another batch will need it
-					move_effect_before(effect, create_text());
-
 					this.#offscreen.set(k, effect);
 				} else {
 					destroy_effect(effect);

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

@@ -151,7 +151,6 @@ function destroy_effects(state, to_destroy, remove_dom = true) {
 
 		if (preserved_effects?.has(e)) {
 			e.f |= EFFECT_OFFSCREEN;
-			move_effect_before(e, create_text());
 		} else {
 			destroy_effect(to_destroy[i], remove_dom);
 		}