mailboxes=("ALL", ) not working anymore for seznam.cz

Hello,

I'm using getmail-4.53.0 on OpenBSD amd64. I'm downloading emails from
many accounts and doing that for years. I use for all accounts

SimpleIMAPSSLRetriever
mailboxes=("ALL", )

One two weeks ago, for one account and only for that account on
seznam.cz I started to got this error

operation error (no match for list respodren) NIL "INBOX"")

I contacted their support with question, what has changed
on their IMAP interface, but they stated, that there was no change on
their side.

So I changed my configuration to
mailboxes=("INBOX", )

and I can get my emails again.

Is this something, where debugging can be helpful?

Thank you very much for getmail,
Jiri