imap ---- LIST "" * The returned mailbox does not display quotes

dovecot version

v2.2.29

v2.2.36

v2.3.5

LIST "" * The returned mailbox does not display quotes

dovecot version

v2.1.17

LIST "" * The returned mailbox shows quotation marks

Why is the quotation mark removed in the new version?

Is there any configuration option in the new version to add quotes?

Because I see a lot of big public mailboxes with quotation marks.