Failed to re-hydrate - meaning?

Since 6.2.0 I see more of the below ones
Jun 17 08:57:38 spin-189472 concourse[726067]: {"timestamp":"2020-06-17T06:57:38.172950856Z","level":"error","source":"baggageclaim","message":"baggageclaim.api.volume-server.list-volumes.list-volumes.failed-hydrating-volume","data":{"error":"EOF","session":"4.1.1693.1"}}

could somebody shed some light what’s happening here?

Note that this happens in bursts, it is not a single event.

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