unrecognized cast: {:sync_err, :node_ignored}

[evadne]

Swarm 3.3.1 on Elixir 1.7.2 + Erlang/OTP 21.0.5

During a rolling deployment I have observed the following:

[tracker:syncing] the remote tracker we're syncing with has crashed, selecting a new one
[tracker:syncing] no other available nodes, cancelling sync
[tracker:handle_cast] unrecognized cast: {:sync_err, :node_ignored}
[tracker:nodedown] nodedown [email protected]
[tracker:handle_topology_change] topology change complete

The unrecognized cast might indicate a problem?