Tracking issue: problems with @defer and fetchMore

[phryneas]

Issue Description

We got a report from a customer that using @defer with fetchMore leads to errors like

Missing field '...' while writing result ...

and as a final result, the data property of the hook return object becomes undefined.

Link to Reproduction

internal Jira issue TSH-17173

Reproduction Steps

I've reproduced this and can verify it happens - more details can be found in the Jira issue, I'm omitting it here because it was reproduced on customer systems.

@apollo/client version

3.12.4