dovecot - Jan 2021 - Enabling auth_cache_verify_password_with_worker disables proxy mode

Setting "auth_cache_verify_password_with_worker = yes" in order to
leverage multiple cores for the Dovecot authentication-process causes Dovecot
not to proxy anymore. With debug-logging I figured:

auth_cache_verify_password_with_worker = no

passdb out: OK 1 user=username host=bla port=10993 ssl=any-cert
mail_crypt_global_public_key=key mail_crypt_global_private_key=otherkey
?hostip=123.123.123.123 proxy pass=pw

auth_cache_verify_password_with_worker = yes

passdb out: OK 1 user=username

The rest seems missing.

Dovecot version: v2.3.11.3

Searching for this issue, I found at least two posts mentioning the same
symptoms:

https://dovecot.org/pipermail/dovecot/2018-April/111583.html
https://dovecot.org/pipermail/dovecot/2020-April/118564.html
https://listen.jpberlin.de/pipermail/dovecot/2020-April/001915.html (same as the
english one from april 2020)?????
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> On 28/01/2021 20:22 Malte Schmidt <m at maltris.org> wrote:
> 
> 
> Setting "auth_cache_verify_password_with_worker = yes" in order
to leverage multiple cores for the Dovecot authentication-process causes Dovecot
not to proxy anymore. With debug-logging I figured:
> 
> auth_cache_verify_password_with_worker = no
> 
> passdb out: OK 1 user=username host=bla port=10993 ssl=any-cert
mail_crypt_global_public_key=key mail_crypt_global_private_key=otherkey
hostip=123.123.123.123 proxy pass=pw
> 
> auth_cache_verify_password_with_worker = yes
> 
> passdb out: OK 1 user=username
> 
> The rest seems missing.
> 
> Dovecot version: v2.3.11.3
> 
> Searching for this issue, I found at least two posts mentioning the same
symptoms:
> 
> https://dovecot.org/pipermail/dovecot/2018-April/111583.html
> https://dovecot.org/pipermail/dovecot/2020-April/118564.html
> https://listen.jpberlin.de/pipermail/dovecot/2020-April/001915.html (same
as the english one from april 2020)
Hi!

Thanks for taking the time to report this. We are tracking this now as DOP-2235.

Aki