求助，Laravel 使用 memcached的奇怪问题，能put 不能get?

laravel 8本地测试，选择file缓存，都没问题，后来按文档选择了 memcached作缓存，没有任何报错，看起来好象工作正常：如果永久缓存，能正常get；如果设了过期时间，就 get null; 请问如何解决？

>>> Cache::getMemcached()->getStats()
=> [
     "127.0.0.1:11211" => [
       "pid" => 5900,
       "uptime" => 3055923696.0,
       "time" => 390119688,
       "version" => "1.4.4-14-g9c660c0",
       "pointer_size" => 64,
       "curr_connections" => 12,
       "total_connections" => 224,
       "connection_structures" => 16,
       "cmd_get" => 57797,
       "cmd_set" => 16075,
       "cmd_flush" => 1,
       "get_hits" => 3457,
       "get_misses" => 54340,
       "delete_misses" => 0,
       "delete_hits" => 2,
       "incr_misses" => 0,
       "incr_hits" => 0,
       "decr_misses" => 0,
       "decr_hits" => 0,
       "cas_misses" => 0,
       "cas_hits" => 0,
       "cas_badval" => 0,
       "auth_cmds" => 0,
       "auth_errors" => 0,
       "bytes_read" => 15010440,
       "bytes_written" => 62954825,
       "limit_maxbytes" => 536870912,
       "accepting_conns" => 1,
       "listen_disabled_num" => 0,
       "threads" => 4,
       "conn_yields" => 0,
       "bytes" => 991221,
       "curr_items" => 1538,
       "total_items" => 15238,
       "evictions" => 0,
     ],
   ]
>>> Cache::get('test')
=> null
>>> Cache::put('test', 'adsfasdfasdf', 30000)
=> true
>>> Cache::get('test')
=> null
>>> Cache::put('test', 'adsfasdfasdf')
=> true
>>> Cache::get('test')
=> "adsfasdfasdf"