fix: handle private chat sender

packages/client/src/types/messages/message.ts

@@ -229,8 +229,15 @@ export class Message {
         if (this._sender === undefined) {
             const from = this.raw.fromId
             if (!from) {
-                // anon admin, return the chat
-                this._sender = this.chat
+                if (this.raw.peerId._ === 'peerUser') {
+                    this._sender = new User(
+                        this.client,
+                        this._users[this.raw.peerId.userId]
+                    )
+                } else {
+                    // anon admin, return the chat
+                    this._sender = this.chat
+                }
             } else
                 switch (from._) {
                     case 'peerChannel': // forwarded channel post

packages/dispatcher/src/filters.ts

@@ -300,7 +300,10 @@ export namespace filters {
      */
     export const chat = <T extends Chat.Type>(
         type: T
-    ): UpdateFilter<Message, { chat: Modify<Chat, { type: T }> }> => (msg) =>
+    ): UpdateFilter<Message, {
+        chat: Modify<Chat, { type: T }>
+        sender: T extends 'private' | 'bot' | 'group' ? User : User | Chat
+    }> => (msg) =>
         msg.chat.type === type
 
     /**