[pfx] header_checks sees original From: header despite smtpd m ilter correction — execution order question

Hi,
I am trying to understand the exact execution order between header_checks/cleanup and smtpd_milters.
I have a custom milter that repairs invalid From: headers 
Example flow from logs:
1.- cleanup logs a header_checks warning on the original header From: <[email protected]>
2.- Then my milter replaces it with: From: <[email protected]>
3.- milter works ok, since postcat shows the corrected header in the queued message.
What confuses me is that according to my reading of MILTER_README, smtpd milters run before queuing, so I expected cleanup/header_checks to see the modified header rather than the original one. However, the log shows that cleanup sees [email protected] and not [email protected].
Am I misunderstanding how cleanup interacts with SMTP milters internally?
Thanks
Pete.

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