rx.markdown crash when display content in rx.State

[suc1]

Describe the bug

[Reflex Frontend Exception]
 Assertion: Unexpected value `` for `children` prop, expected `string`
Assertion: Unexpected value `` for `children` prop, expected `string`
    at assert (http://localhost:3000/node_modules/.vite/deps/development-Cjbcu6kc.js?v=acd41aed:93:64)
    at unreachable (http://localhost:3000/node_modules/.vite/deps/development-Cjbcu6kc.js?v=acd41aed:74:2)
    at createFile (http://localhost:3000/node_modules/.vite/deps/react-markdown.js?v=acd41aed:13621:7)
    at Markdown (http://localhost:3000/node_modules/.vite/deps/react-markdown.js?v=acd41aed:13529:15)
    at Object.react_stack_bottom_frame (http://localhost:3000/node_modules/.vite/deps/react-dom_client.js?v=acd41aed:12868:12)
    at renderWithHooks (http://localhost:3000/node_modules/.vite/deps/react-dom_client.js?v=acd41aed:4213:19)
    at updateFunctionComponent (http://localhost:3000/node_modules/.vite/deps/react-dom_client.js?v=acd41aed:5569:16)
    at beginWork (http://localhost:3000/node_modules/.vite/deps/react-dom_client.js?v=acd41aed:6140:20)
    at runWithFiberInDEV (http://localhost:3000/node_modules/.vite/deps/react-dom_client.js?v=acd41aed:851:66)
    at performUnitOfWork (http://localhost:3000/node_modules/.vite/deps/react-dom_client.js?v=acd41aed:8429:92)

To Reproduce
load_static_page/[swp_id] load different file according to swp_id. rx.text is ok but rx.markdown crash.

Code

class LoadStaticPageState(rx.State):
    page_content: str = ''
	
	@rx.event
    def load_page(self) -> None:
        # Router URL: http://localhost:3000/load_static_page/design_recipe
        urlPath = self.router.url.path
        swp_id = urlPath.rstrip("/").split("/")[-1]
        # swp_id = self.router.url.query_parameters.get("swp_id", 'install')	# why not work
        
        file_name = self._pages.get(swp_id, 'webPages/install.md')
        fp = ASSETS_DIR / file_name
        self.page_content =  fp.read_text(encoding="utf-8")


@rx.page(route=f"load_static_page/[swp_id]",
         on_load=LoadStaticPageState.load_page,         
         )
def LoadStaticPage() -> rx.Component:
    # load_static_page/[swp_id]                         # static web page id
    # load_static_page/design_largeModel
    
    content = LoadStaticPageState.page_content

    my_child = rx.markdown(content)       # crash
    # my_child = rx.text(content)		# ok
    
    return my_child

Specifics (please complete the following information):

• Python Version: 3.13.7
• Reflex Version: 0.9.2.post1
• OS: Windows 11
• Browser (Optional): Edge

Additional context
The markdown file is ok on 0.8 reflex

[linear-code]

ENG-9653