From:

[https://unity3d.zendesk.com/agent/tickets/1646059]

We have been starting to use the Unity Accelerator and have noticed that if the connection is broken (when updating the artifacts) then the async function that sends the data will crash (this appears to be the same crash, but not fixed as at 2023.1.9f1 - even though it says it is https://issuetracker.unity3d.com/issues/crash-on-tcpprotobufclient-endbatch-when-creating-a-prefab-and-cache-server-is-disconnected ) .
It happens on the assert, I did infact patch it locally so that it would return rather than assert and that led to the async task timing out rather than the editor crashing. I think the timeout is due to the connection id changing on a reconnect. A proper fix would maybe return with a false if the error occurs, then something to try to reconnect or update the current connection ID so it can resume if possible.