fix

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

@@ -227,7 +227,15 @@ export function pop(component) {
 
 /** @returns {boolean} */
 export function is_runes() {
-	return !legacy_mode_flag || (component_context !== null && component_context.l === null);
+	if (!legacy_mode_flag) {
+		return true;
+	}
+
+	// TODO feels like we could probably simplify this a bit. no tests fail without
+	// the first part, though would like to better understand usage before deleting
+	const context = component_context ?? active_reaction?.ctx ?? active_effect?.ctx;
+
+	return context?.l === null;
 }
 
 /**

packages/svelte/src/internal/client/dom/elements/bindings/input.js

@@ -7,7 +7,6 @@ import { is } from '../../../proxy.js';
 import { queue_micro_task } from '../../task.js';
 import { hydrating } from '../../hydration.js';
 import { tick, untrack } from '../../../runtime.js';
-import { is_runes } from '../../../context.js';
 import { current_batch, previous_batch } from '../../../reactivity/batch.js';
 import { async_mode_flag } from '../../../../flags/index.js';