[email protected]        [email protected]
  [email protected]     [email protected]
  [email protected]    [email protected]

The strange thing is that only the first and third aliases work. The
support@ alias is not resolved, Postfix just sends it on to Dovecot
with [email protected] as final recipient.

Is there some special-casing for a support@ local poart of some kind?

Nope. Nothing special about support@.
No one will be able to understand the issue without seeing some logs of the 
event and configuration of your setup.

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