some messages in mpool disappeared

[NealLiu-Test2]

Describe the bug
in space race, my miner id is t02490,
worker address is t3qlp7se6vaw6yg3sjm2pme3xbfw7avhjng2ilmkejujbmxrsv7v5netdonvcrj5rez5epawkxpnzaei27esna.
messages in mpool is begin from 69011, but in filfox.io and other explorer， the biggest Nonce i can found is 68980. the messages with Nonce 68981-69010 were disappeared , neither on the chain nor in the mpool. messages in mpool cannot go to the chain now. because there is no messages with 68981.....................

To Reproduce
Steps to reproduce the behavior:

1. I used lotus mpool replace to increase the gas of some message , so let them go to the chain.
2. after running some lotus mpool replace commands, i found messages with Nonce 68981-69010 were disappeared.

Expected behavior
is this a bug ? how can i find the disappeared messages back?

Screenshots
https://filecoinproject.slack.com/files/U0197DEDKLN/F01AKC1H1T4/image.png

Version (run lotus version):
lotus version 0.7.0+git.232cc320

Additional context
Add any other context about the problem here.

[NealLiu-Test2]

after restarting the daemon, the lost messages finally go to the chain, but several hours have passed since them disappeared. if i dont restart the daemon, it will never go to the chain. this must be a bug!

[vyzo]

it's a bug, and it has been fixed in #3772 (it's merged in master).