:art: https://github.com/siyuan-note/siyuan/issues/11972

app/src/protyle/toolbar/index.ts

@@ -1185,8 +1185,10 @@ export class Toolbar {
 
     private updateLanguage(languageElement: HTMLElement, protyle: IProtyle, id: string, nodeElement: HTMLElement, oldHtml: string, selectedLang: string) {
         languageElement.textContent = selectedLang === window.siyuan.languages.clear ? "" : selectedLang;
-        window.siyuan.storage[Constants.LOCAL_CODELANG] = languageElement.textContent;
-        setStorageVal(Constants.LOCAL_CODELANG, window.siyuan.storage[Constants.LOCAL_CODELANG]);
+        if (!Constants.SIYUAN_RENDER_CODE_LANGUAGES.includes(languageElement.textContent)) {
+            window.siyuan.storage[Constants.LOCAL_CODELANG] = languageElement.textContent;
+            setStorageVal(Constants.LOCAL_CODELANG, window.siyuan.storage[Constants.LOCAL_CODELANG]);
+        }
         const editElement = getContenteditableElement(nodeElement);
         if (Constants.SIYUAN_RENDER_CODE_LANGUAGES.includes(languageElement.textContent)) {
             nodeElement.dataset.content = editElement.textContent.trim();

app/src/protyle/wysiwyg/enter.ts

@@ -83,7 +83,7 @@ export const enter = (blockElement: HTMLElement, range: Range, protyle: IProtyle
             if (languageElement) {
                 if (window.siyuan.storage[Constants.LOCAL_CODELANG] && languageElement.textContent === "") {
                     languageElement.textContent = window.siyuan.storage[Constants.LOCAL_CODELANG];
-                } else {
+                } else if (!Constants.SIYUAN_RENDER_CODE_LANGUAGES.includes(languageElement.textContent)) {
                     window.siyuan.storage[Constants.LOCAL_CODELANG] = languageElement.textContent;
                     setStorageVal(Constants.LOCAL_CODELANG, window.siyuan.storage[Constants.LOCAL_CODELANG]);
                 }