'internal-sftp' subsystem from SSH daemon does not use the specified log-facility

Issue

• We are using the internal-sftp subsystem built-in to sshd for the purposes of allowing a jailed environment for users to upload/download files.
• We have specified a particular logging facility in the configuration file, like so:

[...]
Subsystem       sftp    internal-sftp -l VERBOSE -f LOCAL6
[...]

• Moreover, we configured the logging for the chrooted environment by following this article
• However, sftp-related messages aren't logged using the specified log facility. Messages are sent using the default sshd logging facility.
• We have disabled SELinux.
• This setup was working up until December 2012. An update after that broke the functionality for RHEL 6 as well as RHEL 5.