[Imap-protocol] Gmail IMAP responses are sporadically missing fields

Hi folks,
Since Monday, we've been encountering issues in which we issue IMAP calls
to Gmail such as

UID FETCH 299 (X-GM-MSGID X-GM-THRID)

and the response sporadically does not actually contain a value for
X-GM-MSGID. Upon retrying, we generally get a complete response.

Is this behavior expected, and something we should work around? Or is
something awry?

For completeness, other calls that sometimes give incomplete responses:
UID FETCH 296 (BODY.PEEK[] INTERNALDATE FLAGS X-GM-THRID X-GM-MSGID
X-GM-LABELS)
(response missing BODY[])

UID FETCH 288 X-GM-LABELS
(response missing X-GM-LABELS)

Thanks,
Eben

PS. Apologies if this list is the wrong venue for this question -- if so,
is there a better one?

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