SSHD local port forwarding close session unexpectedly

Apache SSHD used in local port forwarding mode.
A client is connecting to a remote FTP server through Apache SSHD via a custom software.
When a new logical channel inside a single SSHD session get an IO error (e.g. the remote destination close the connection suddenly, the whole session is shut down causing all other logical channel to be closed (see line 8861of attached trace file).

It seems like the exceptionCaught mathod should not be called in this case