On Koha 22.11.04-1 installed with the Debian packages I have some background jobs that are failing, and I see this in the logs: 

==> /var/log/koha/mykoha/plack-intranet-error.log <==
[2024/01/19 08:47:02] [WARN] The job has not been sent to the message broker: (Can't locate object method "throw" via package "Koha::Exceptions::Exception" (perhaps you forgot to load "Koha::Exceptions::Exception"?) at /usr/share/koha/lib/Koha/BackgroundJob.pm line 141.
) at /usr/share/koha/lib/Koha/BackgroundJob.pm line 148.

The relevant code looks like this: 

134     try {
135         # This namespace is wrong, it must be a vhost instead.
136         # But to do so it needs to be created on the server => much more work when a new Koha instance is created.
137         # Also, here we just want the Koha instance's name, but it's not in the config...
138         # Picking a random id (memcached_namespace) from the config
139         my $namespace = C4::Context->config('memcached_namespace');
140         my $encoded_args = Encode::encode_utf8( $json_args ); # FIXME We should better leave this to Net::Stomp?
141         $conn->send_with_receipt( { destination => sprintf("/queue/%s-%s", $namespace, $job_queue), body => $encoded_args } )
142           or Koha::Exceptions::Exception->throw('Job has not been enqueued');
143     } catch {
144         $self->status('failed')->store;
145         if ( ref($_) eq 'Koha::Exceptions::Exception' ) {
146             $_->rethrow;
147         } else {
148             warn sprintf "The job has not been sent to the message broker: (%s)", $_;
149         }
150     };

This code is the only place Koha::Exceptions::Exception is mentioned in the code:

$ sudo grep -rn "Koha::Exceptions::Exception" /usr/share/koha/
/usr/share/koha/lib/Koha/BackgroundJob.pm:142:          or Koha::Exceptions::Exception->throw('Job has not been enqueued');
/usr/share/koha/lib/Koha/BackgroundJob.pm:145:        if ( ref($_) eq 'Koha::Exceptions::Exception' ) {