diff --git a/package.json b/package.json
index eb30919..e7b7dc6 100644
--- a/package.json
+++ b/package.json
@@ -24,7 +24,7 @@
   "devDependencies": {
     "@koishijs/eslint-config": "^1.0.4",
     "@koishijs/plugin-database-memory": "^2.3.0",
-    "@koishijs/plugin-mock": "^2.5.0",
+    "@koishijs/plugin-mock": "^2.5.2",
     "@koishijs/vitepress": "^3.0.0",
     "@sinonjs/fake-timers": "^6.0.1",
     "@types/mocha": "^9.1.1",
@@ -48,7 +48,7 @@
     "yakumo-publish": "^0.3.3",
     "yakumo-publish-sync": "^0.3.3",
     "yakumo-tsc": "^0.3.12",
-    "yakumo-upgrade": "^0.3.2",
+    "yakumo-upgrade": "^0.3.4",
     "yakumo-version": "^0.3.2",
     "vitepress": "1.0.0-rc.4"
   }
diff --git a/packages/author/src/index.ts b/packages/author/src/index.ts
index 2d4d76e..6f034be 100644
--- a/packages/author/src/index.ts
+++ b/packages/author/src/index.ts
@@ -115,7 +115,7 @@ export function apply(ctx: Context, config: Config) {
       }
     }
 
-    if (options.action !== 'modify' && hasUnnamed && session.subtype === 'group') {
+    if (options.action !== 'modify' && hasUnnamed && !session.isDirect) {
       try {
         const memberMap = await session.bot.getGuildMemberMap(session.guildId)
         for (const userId in memberMap) {
diff --git a/packages/context/src/index.ts b/packages/context/src/index.ts
index a8d6ab2..cb61ea7 100644
--- a/packages/context/src/index.ts
+++ b/packages/context/src/index.ts
@@ -93,7 +93,7 @@ export function apply(ctx: Context, config: Config) {
         } else {
           defineProperty(options, '_guilds', options.guilds ? options.guilds.split(',').map(id => `${session.platform}:${id}`) : [])
         }
-      } else if (session.subtype !== 'group' && options['partial']) {
+      } else if (session.isDirect && options['partial']) {
         return session.text('.context.private-context')
       } else {
         defineProperty(options, '_guilds', guilds)
@@ -142,7 +142,7 @@ export function apply(ctx: Context, config: Config) {
   })
 
   ctx.on('dialogue/detail', ({ guilds, flag }, detail, session) => {
-    const includeCurrentGuild = session.subtype === 'group' && guilds.includes(session.gid)
+    const includeCurrentGuild = !session.isDirect && guilds.includes(session.gid)
     const prefix = flag & Dialogue.Flag.complement ? 'enable-' : 'disable-'
     const path = includeCurrentGuild
       ? 'except-current-' + (guilds.length - 1 ? 'and-more' : 'only')
@@ -152,7 +152,7 @@ export function apply(ctx: Context, config: Config) {
 
   ctx.on('dialogue/abstract', ({ guilds, flag }, output, session) => {
     const { options } = session.argv
-    if (!options._guilds && session.subtype === 'group') {
+    if (!options._guilds && !session.isDirect) {
       const isReversed = flag & Dialogue.Flag.complement
       const hasGroup = guilds.includes(session.gid)
       output.unshift(!isReversed === hasGroup ? isReversed ? 'E' : 'e' : isReversed ? 'd' : 'D')
diff --git a/packages/core/src/internal.ts b/packages/core/src/internal.ts
index 116e8f0..5c00797 100644
--- a/packages/core/src/internal.ts
+++ b/packages/core/src/internal.ts
@@ -80,6 +80,8 @@ export default function apply(ctx: Context, config: Dialogue.Config) {
     const [question, answer] = args
 
     function applySuggestion(session: Dialogue.Session) {
+      // Create a new session to isolate i18n scope.
+      session = Object.create(session)
       return session.withScope('commands.teach.messages', () => {
         return session.argv.options.target ? analyze(session) : create(session)
       })
diff --git a/packages/core/src/search.ts b/packages/core/src/search.ts
index e4119d6..21b5641 100644
--- a/packages/core/src/search.ts
+++ b/packages/core/src/search.ts
@@ -79,7 +79,7 @@ export default function apply(ctx: Context) {
         ...test,
         regexp: null,
         question: parsed,
-        original: original,
+        original,
       })
       Object.defineProperty(dialogue, '_redirections', { writable: true, value: dialogues })
       await ctx.parallel('dialogue/search', session, test, dialogues)