Upgrade to Vault 1.17 causing follows to rpc error trying to talk to the leader

After Updating Vault from 1.16.3 to 1.17.1 I found my cluster basically fell over and the passive/follower nodes output lots of errors of the form:

error during forwarded RPC request: error="rpc error: code = Unavailable desc = connection error: desc = \"transport: Error while dialing: dial tcp <active instance ip>:8201: connect: connection refused\""

Is anyone aware of a change between 1.16 and 1.17 that might cause this behaviour?