Fix incorrect attribute reuse

Author: zhousheng06

redis/connection.py

@@ -870,9 +870,11 @@ def read_response(
                 and self._cache.get(self._current_command_cache_key).status
                 != CacheEntryStatus.IN_PROGRESS
             ):
-                return copy.deepcopy(
+                res = copy.deepcopy(
                     self._cache.get(self._current_command_cache_key).cache_value
                 )
+                self._current_command_cache_key = None
+                return res
 
         response = self._conn.read_response(
             disable_decoding=disable_decoding,
@@ -898,6 +900,8 @@ def read_response(
                 cache_entry.cache_value = response
                 self._cache.set(cache_entry)
 
+            self._current_command_cache_key = None
+
         return response
 
     def pack_command(self, *args):