ship in 4.0.4: head.block_num is 2 blocks behind trace_end_block and chain_state_end_block

[cc32d9]

Head block in ship response to get_status_request_v0 is supposed to be the same as the last block in traces.

As of 4.0.4, the head block is always 2 blocks behind. Here's the test that reproduces it with Proton mainnet (Proton is much smaller than EOS, but running standard Leap software).

# Ubuntu 22.04

wget https://github.com/AntelopeIO/leap/releases/download/v4.0.4/leap_4.0.4-ubuntu22.04_amd64.deb
apt install ./leap_4.0.4-ubuntu22.04_amd64.deb

mkdir -p /srv/proton/etc

cat >/srv/proton/etc/config.ini <<'EOT'
chain-state-db-size-mb = 65536
wasm-runtime = eos-vm-jit
eos-vm-oc-enable = false
http-server-address = 0.0.0.0:8888
p2p-listen-endpoint = 0.0.0.0:9805
validation-mode = light
plugin = eosio::chain_plugin
plugin = eosio::chain_api_plugin
plugin = eosio::state_history_plugin
trace-history = true
chain-state-history = true
state-history-endpoint = 0.0.0.0:8080
p2p-peer-address = proton.cryptolions.io:9876
p2p-peer-address = proton.eu.eosamsterdam.net:9103
p2p-peer-address = p2p-proton.eosarabia.net:9876
EOT

curl http://seed01.eosusa.news/snaps/proton/proton-2023-09-29_08-00.tar.gz | tar xzvf -

nohup /usr/bin/nodeos --data-dir /srv/proton/data --config-dir /srv/proton/etc --disable-replay-opts --snapshot snapshot-0ce9cdac014dbf27263b2a00442d9c47f64a43a3121109707a8e937dba9e205e.bin &


curl -sL https://deb.nodesource.com/setup_18.x -o nodesource_setup.sh
bash nodesource_setup.sh 
apt install -y nodejs

git clone https://github.com/cc32d9/eos-nagios-plugins.git /opt/eos-nagios-plugins

cd /opt/eos-nagios-plugins/ship
npm install

./check_eosio_ship  --url-ws http://127.0.0.1:8080 --url-api http://127.0.0.1:8888
CRITICAL - state history corrupted

# after adding "console.error(response); "

{
  head: {
    block_num: 216656945,
    block_id: '0CE9EC31CF64DD66449D01B4B92EB0C615916A41812593FDF0C5F2FE96581D5D'
  },
  last_irreversible: {
    block_num: 216656612,
    block_id: '0CE9EAE452780BA4B1A041F6E0EEB8918486F11479FBC1EDBF8CB8F14F3A8E6B'
  },
  trace_begin_block: 216649133,
  trace_end_block: 216656947,
  chain_state_begin_block: 216649132,
  chain_state_end_block: 216656947,
  chain_id: '384DA888112027F0321850A169F737C33E53B388AAD48B5ADACE4BAB97F437E0'
}