Yes a post Armistice event. Could be patrolling for German stragglers, plus the Allied intervention in Russia (Archangel Expedition to support the White Russians) was really kicking off at this time - they could have been deployed in relation to that, as I imagine there would be a good number of Military transports going up and down the North Sea. Whether there was any chance of a Bolshevik threat to allied shipping I do not know! (The Wikipedia page says they had been out to the Dogger Bank)
Papers don't have much detail on the sinking that I can see:
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