So this is intended. When a cluster node is removed, it's effectively wiped.
Removing the cluster node first checks that all instances and volumes
are gone from it (it will refuse to remove otherwise), it then wipes
any remaining local references to storage pools and networks, the
server certificate is then removed from the trusted store in the
cluster and the server instructed to remove the certificate and
restart using its own local certificate. Lastly the database available
to the remote cluster server is stripped of just about everything
except the records that were specific to that node (like its address).
This means that the trust store is completely wiped as is config like
core.trust_password (which you only use on initial join, the
certificate in the trust store being gone is what's actually
preventing you access).
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