altnamespace doesn't seem to be working in 2.4.17

[Brian J. Murrell]

In 2.4.17 of Cyrus IMAPD I have the following /etc/imapd.conf:

configdirectory: /var/lib/imap
partition-default: /var/spool/imap
admins: cyrus brian
sievedir: /var/lib/imap/sieve
sendmail: /usr/sbin/sendmail
hashimapspool: true
sasl_pwcheck_method: saslauthd
sasl_mech_list: LOGIN GSSAPI PLAIN
allowplaintext: no
defaultdomain: mail
tls_cert_file: /etc/pki/cyrus-imapd/cert.pem
tls_key_file: /etc/pki/cyrus-imapd/privkey.pem
tls_ca_file: /etc/pki/cyrus-imapd/fullchain.pem
altnamespace: yes
autocreatequota: 0
lmtp_downcase_rcpt: yes
sasl_keytab: /etc/krb5_cyrus.keytab
autocreate_post: 1

Yet I am still seeing my folders as children of INBOX.  Is there
something I am missing?

Cheers,
b.
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