diff --git a/nonebot/adapters/cqhttp/message.py b/nonebot/adapters/cqhttp/message.py
index f8e57af7..ae7fe7b6 100644
--- a/nonebot/adapters/cqhttp/message.py
+++ b/nonebot/adapters/cqhttp/message.py
@@ -14,8 +14,6 @@ class MessageSegment(BaseMessageSegment):
 
     @overrides(BaseMessageSegment)
     def __init__(self, type: str, data: Dict[str, Any]) -> None:
-        if type == "text":
-            data["text"] = unescape(data["text"])
         super().__init__(type=type, data=data)
 
     @overrides(BaseMessageSegment)
@@ -215,17 +213,16 @@ class Message(BaseMessage):
                     r"(?P<params>"
                     r"(?:,[a-zA-Z0-9-_.]+=[^,\]]+)*"
                     r"),?\]", msg):
-                yield "text", unescape(msg[text_begin:cqcode.pos +
-                                           cqcode.start()])
+                yield "text", msg[text_begin:cqcode.pos + cqcode.start()]
                 text_begin = cqcode.pos + cqcode.end()
                 yield cqcode.group("type"), cqcode.group("params").lstrip(",")
-            yield "text", unescape(msg[text_begin:])
+            yield "text", msg[text_begin:]
 
         for type_, data in _iter_message(msg):
             if type_ == "text":
                 if data:
                     # only yield non-empty text segment
-                    yield MessageSegment(type_, {"text": data})
+                    yield MessageSegment(type_, {"text": unescape(data)})
             else:
                 data = {
                     k: unescape(v) for k, v in map(
diff --git a/nonebot/plugins/base.py b/nonebot/plugins/base.py
index 1c74a7cc..bf4e9619 100644
--- a/nonebot/plugins/base.py
+++ b/nonebot/plugins/base.py
@@ -1,24 +1,22 @@
 from functools import reduce
 
 from nonebot.rule import to_me
-from nonebot.typing import T_State
 from nonebot.plugin import on_command
 from nonebot.permission import SUPERUSER
-from nonebot.adapters import Bot, Event, Message, MessageSegment
+from nonebot.adapters.cqhttp import Bot, unescape, MessageEvent, Message, MessageSegment
 
 say = on_command("say", to_me(), permission=SUPERUSER)
 
 
 @say.handle()
-async def say_unescape(bot: Bot, event: Event, state: T_State):
-    MessageImpl = event.get_message().__class__
+async def say_unescape(bot: Bot, event: MessageEvent):
 
     def _unescape(message: Message, segment: MessageSegment):
         if segment.is_text():
-            return message.append(str(segment))
+            return message.append(unescape(str(segment)))
         return message.append(segment)
 
-    message = reduce(_unescape, event.get_message(), MessageImpl())
+    message = reduce(_unescape, event.get_message(), Message())  # type: ignore
     await bot.send(message=message, event=event)
 
 
@@ -26,5 +24,5 @@ echo = on_command("echo", to_me())
 
 
 @echo.handle()
-async def echo_escape(bot: Bot, event: Event, state: T_State):
+async def echo_escape(bot: Bot, event: MessageEvent):
     await bot.send(message=event.get_message(), event=event)
diff --git a/nonebot/typing.py b/nonebot/typing.py
index 72e6f47a..4b1be10b 100644
--- a/nonebot/typing.py
+++ b/nonebot/typing.py
@@ -17,17 +17,19 @@
 .. _typing:
     https://docs.python.org/3/library/typing.html
 """
-
-from typing import Any, Dict, Union, TypeVar, Protocol, overload, Optional, Callable, NoReturn, Awaitable, TYPE_CHECKING
+from collections.abc import Callable as BaseCallable
+from typing import Any, Dict, Union, TypeVar, Optional, Callable, NoReturn, Awaitable, TYPE_CHECKING
 
 if TYPE_CHECKING:
     from nonebot.adapters import Bot, Event
     from nonebot.matcher import Matcher
 
+T_Wrapped = TypeVar("T_Wrapped", bound=BaseCallable)
+
 
 def overrides(InterfaceClass: object):
 
-    def overrider(func: Callable) -> Callable:
+    def overrider(func: T_Wrapped) -> T_Wrapped:
         assert func.__name__ in dir(
             InterfaceClass), f"Error method: {func.__name__}"
         return func