mail_utf8_extensions and IMAP Folder Naming

i just upgraded my 2.3 installation to 2.4. I like to be bleeding edge and i want to use SMTPUTF8.

I came across problems with mailboxes that have german umlauts.
when enabling "mail_utf8_extensions=yes" e.g. Microsoft Outlook gives me mUTF-7 encoded folder names.
Also the folder names when list via openssl s_client are encoded in mUTF-7.
Am i missing something or can i disable utf8 for IMAP (UTF8=ACCEPT) only, but keep for LMTP Transport/SMTPUTF8 from postfix to dovecot?

I am using mdbox format as storage, if that matters.

My namespace config (shortened):
namespace inbox {
  inbox = yes
  type = private

  #mailbox_list_utf8 = yes # also tried this -> when folder didn't exist before it would create a new one with utf8, no matter mail_utf8_extensions is on or off

  mailbox Drafts {
    auto = no
    special_use = \Drafts
  }
  mailbox Entw&APw-rfe {
    special_use = \Drafts
  }
  mailbox Entw%26APw-rfe {
    special_use = \Drafts
  }
  mailbox Entw\&APw-rfe {
    special_use = \Drafts
  }
  mailbox Entwürfe {
    auto = create
    special_use = \Drafts
  }
  mailbox Trash {
    auto = no
    special_use = \Trash
    quota_storage_percentage = 110
  }
  mailbox "Gel&APY-schte Elemente" {
    special_use = \Trash
    quota_storage_percentage = 110
  }
  mailbox "Gelöschte Elemente" {
    auto = subscribe
    special_use = \Trash
    quota_storage_percentage = 110
  }
  mailbox Sent {
    auto = no
    special_use = \Sent
  }
  mailbox Archiv {
    auto = subscribe
    special_use = \Archive
  }

  mailbox Spam {
    special_use = \Junk
    auto = no
  }
}
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