frontend/src/App.tsx

@@ -1,7 +1,7 @@
 import axios from 'axios'
 import toCamel from 'camelcase-keys'
 import { useEffect, useState } from 'react'
-import { BrowserRouter, Navigate, Route, Routes } from 'react-router-dom'
+import { BrowserRouter, Navigate, Route, Routes, useLocation } from 'react-router-dom'
 
 import RouteBlockerOverlay from '@/components/RouteBlockerOverlay'
 import TopNav from '@/components/TopNav'
@@ -26,6 +26,13 @@ import type { FC } from 'react'
 import type { User } from '@/types'
 
 
+const PostDetailRoute = ({ user }: { user: User | null }) => {
+  const location = useLocation ()
+  const key = location.pathname
+  return <PostDetailPage key={key} user={user}/>
+}
+
+
 export default (() => {
   const [user, setUser] = useState<User | null> (null)
   const [status, setStatus] = useState (200)
@@ -81,7 +88,7 @@ export default (() => {
 	      <Route path="/" element={<Navigate to="/posts" replace/>}/>
 	      <Route path="/posts" element={<PostListPage/>}/>
 	      <Route path="/posts/new" element={<PostNewPage user={user}/>}/>
-	      <Route path="/posts/:id" element={<PostDetailPage user={user}/>}/>
+	      <Route path="/posts/:id" element={<PostDetailRoute user={user}/>}/>
 	      <Route path="/tags/nico" element={<NicoTagListPage user={user}/>}/>
 	      <Route path="/wiki" element={<WikiSearchPage/>}/>
 	      <Route path="/wiki/:title" element={<WikiDetailPage/>}/>

frontend/src/pages/posts/PostDetailPage.tsx

@@ -30,7 +30,8 @@ export default (({ user }: Props) => {
   const { data: post, isError: errorFlg, error } = useQuery ({
       enabled:          Boolean (id),
       queryKey:         ['posts', String (id)],
-      queryFn:  () => fetchPost (String (id)) })
+      queryFn:          () => fetchPost (String (id)),
+      placeholderData:  undefined })
 
   const qc = useQueryClient ()
 
@@ -68,6 +69,10 @@ export default (({ user }: Props) => {
       setStatus (code)
   }, [errorFlg, error])
 
+  useEffect (() => {
+    setStatus (200)
+  }, [id])
+
   switch (status)
   {
   case 404: