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Since clients read-timeout is lower then member-timeout, client will continue with insertion of data. And again, replication will be halted to replicated servers. At some moment, restarted member will be declared dead, and now we will have halted events  to put in replicated servers, and in parallel new events from client. If new event from client is replicated to other servers, before halted events, then in moment that halted events are notified to replicated servers, they will assume that these are duplicate events (compare sequence Id of received event  to last stored sequence ID), and will not store this data.

In linked PR is created you can find distributed test for reproduction of problem.

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