fix

packages/svelte/src/compiler/phases/3-transform/client/transform-client.js

@@ -332,7 +332,7 @@ export function client_component(source, analysis, options) {
 		}
 	}
 
-	if (analysis.css.ast !== null && options.css === 'injected') {
+	if (analysis.css.ast !== null && analysis.inject_styles) {
 		const hash = b.literal(analysis.css.hash);
 		const code = b.literal(render_stylesheet(analysis.source, analysis, options).code);
 

packages/svelte/src/internal/client/dom/css.js

@@ -1,19 +1,10 @@
-import { DEV } from 'esm-env';
 import { queue_micro_task } from './task.js';
 
-var seen = new Set();
-
 /**
  * @param {Node} anchor
  * @param {{ hash: string, code: string }} css
  */
 export function append_styles(anchor, css) {
-	// in dev, always check the DOM, so that styles can be replaced with HMR
-	if (!DEV) {
-		if (seen.has(css.hash)) return;
-		seen.add(css.hash);
-	}
-
 	// Use `queue_micro_task` to ensure `anchor` is in the DOM, otherwise getRootNode() will yield wrong results
 	queue_micro_task(() => {
 		var root = anchor.getRootNode();