Memcached not creating keys?

Question

memcached

UPD: It looks like the problem is only when working through a socket, because. when running on the standard port 11211, the data is saved.

1. in the console I connect via a socket: nc -U path_to_socket
   
2. I enter: add test_key 0 0 5
   in the log is written:
   27: going from conn_read to conn_parse_cmd
   <27 add test_key 0 0 5
   27: going from conn_parse_cmd to conn_nread
   
3. I enter the line\number 12345
   nothing new appears in the log. jumps to an empty line in the console
   
4. once again I enter the line \ number 12345
   in the console, the lines appear:
   
   • CLIENT_ERROR bad data chunk
     
   • ERROR
     
   
   the log says:
   
   • >27 CLIENT_ERROR bad data chunk
     
   • 27: going from conn_nread to conn_write
     
   • 27: going from conn_write to conn_new_cmd
     
   • 27: going from conn_new_cmd to conn_waiting
     
   • 27: going from conn_waiting to conn_read
     
   • 27: going from conn_read to conn_parse_cmd
     
   • <27 2345
     
   • >27 ERROR
     
   • 27: going from conn_parse_cmd to conn_write
     
   • 27: going from conn_write to conn_new_cmd
     
   • 27: going from conn_new_cmd to conn_waiting
     
   • 27: going from conn_waiting to conn_read