The following is reported during NetconfDeviceTopologyAdapter shutdown:

This is part of , i.e. we have shut down the chain, but the last transaction failed to commit, hence the callback, where we do follow the API spec and issue another close().

Now DOMTransactionChain.close() is supposed to be idempotent to the best of its abilities, as implied by AutoCloseable.close() and the spirit of Registration.close(). Audit AbstractPingPongTransactionChain.close() and make sure it is idempotent.