Using notify_plugin, delaying or losting event must occured after pushing action

[zhopen]

images: boscore/bos:v3.0.0
BP: 2

I pushed action as below:

[root@eosio node]$cl push action hello hi '["zhanghan"]' -p zhanghan
executed transaction: e167450d6374013df0c178ce15c1be23ec23a7bd51ee2db51a4be1a9ddba5122  104 bytes  137 us
#         hello <= hello::hi                    {"user":"zhanghan"}
warning: transaction executed locally, but may not be confirmed by the network yet         ] 
[root@eosio node]$cl push action hello hi '["alice"]' -p alice ; cl push action hello hi '["bob"]' -p bob
executed transaction: e5d7fa6a55b8206f004d826e2ce8115db518ef66722418daf8ba9b7537f04da0  104 bytes  132 us
#         hello <= hello::hi                    {"user":"alice"}
warning: transaction executed locally, but may not be confirmed by the network yet         ] 
executed transaction: 4cbfa444fa9f8cf91a7900b145c5c428d812d97390f43c490de25a89e9262f8b  104 bytes  125 us
#         hello <= hello::hi                    {"user":"bob"}
warning: transaction executed locally, but may not be confirmed by the network yet         ] 

Notify hanlder got post data as below：

------Tue Nov 19 11:42:09 2019------
b'{"irreversible":false,"actions":[{"tx_id":"e167450d6374013df0c178ce15c1be23ec23a7bd51ee2db51a4be1a9ddba5122","account":"hello","name":"hi","seq_num":0,"receiver":"hello","block_time":"2019-11-19T03:42:10.500","block_num":66972,"authorization":[{"actor":"zhanghan","permission":"active"}],"action_data":{"user":"zhanghan"}}]}'

10.255.185.164 - - [19/Nov/2019 11:42:27] "POST /notify HTTP/1.1" 200 -
------Tue Nov 19 11:42:27 2019------  **？？？？？？have a big delay after  trx became irreversible**
b'{"irreversible":true,"actions":[{"tx_id":"e167450d6374013df0c178ce15c1be23ec23a7bd51ee2db51a4be1a9ddba5122","account":"hello","name":"hi","seq_num":0,"receiver":"hello","block_time":"2019-11-19T03:42:10.500","block_num":66972,"authorization":[{"actor":"zhanghan","permission":"active"}],"action_data":{"user":"zhanghan"}}]}'

10.255.185.164 - - [19/Nov/2019 11:42:40] "POST /notify HTTP/1.1" 200 -
------Tue Nov 19 11:42:40 2019------
b'{"irreversible":false,"actions":[{"tx_id":"e5d7fa6a55b8206f004d826e2ce8115db518ef66722418daf8ba9b7537f04da0","account":"hello","name":"hi","seq_num":0,"receiver":"hello","block_time":"2019-11-19T03:42:42.000","block_num":67035,"authorization":[{"actor":"alice","permission":"active"}],"action_data":{"user":"alice"}}]}'

10.255.185.164 - - [19/Nov/2019 11:42:41] "POST /notify HTTP/1.1" 200 -
------Tue Nov 19 11:42:41 2019------
b'{"irreversible":false,"actions":[{"tx_id":"4cbfa444fa9f8cf91a7900b145c5c428d812d97390f43c490de25a89e9262f8b","account":"hello","name":"hi","seq_num":0,"receiver":"hello","block_time":"2019-11-19T03:42:42.500","block_num":67036,"authorization":[{"actor":"bob","permission":"active"}],"action_data":{"user":"bob"}}]}'

10.255.185.164 - - [19/Nov/2019 11:43:17] "POST /notify HTTP/1.1" 200 -
------Tue Nov 19 11:43:17 2019------  **？？？？？？have a big delay after  trx became irreversible**
b'{"irreversible":true,"actions":[{"tx_id":"e5d7fa6a55b8206f004d826e2ce8115db518ef66722418daf8ba9b7537f04da0","account":"hello","name":"hi","seq_num":0,"receiver":"hello","block_time":"2019-11-19T03:42:42.000","block_num":67035,"authorization":[{"actor":"alice","permission":"active"}],"action_data":{"user":"alice"}}]}'

<<？？？？？？
    **if pushing two transactions in almost same time,   lost one irreversible transaction  event  4cbfa444fa9f8cf91a7900b145c5c428d812d97390f43c490de25a89e9262f8b**

head_block_num - last_irreversible_block_num always keeps less than 6.

[root@eosio node]$cl get info
{
  "server_version": "c1387e4b",
  "chain_id": "cf057bbfb72640471fd910bcb67639c22df9f92470936cddc1ade0e2f2e7dc4f",
  "head_block_num": 68069,
  "last_irreversible_block_num": 68067,
  "last_irreversible_block_id": "000109e36c6bdc48dee3d930f8eb40ac128484126d38e4a7981bfb36de84e42b",
  "head_block_id": "000109e5ca6301db0b67087ad0c2f9f9f6d690f52bfc583df5914dc9e8dfa279",
  "head_block_time": "2019-11-19T03:51:19.000",
  "head_block_producer": "prod1",
  "current_view": 8,
  "target_view": 9,
  "last_stable_checkpoint_block_num": 68001,
  "virtual_block_cpu_limit": 200000000,
  "virtual_block_net_limit": 1048576000,
  "block_cpu_limit": 199900,
  "block_net_limit": 1048576,
  "server_version_string": "v3.0.0"
}

[oldcold]

Can you pls confirm if this problem continue happens in later versions?