Upload queues not working

I have a simple scenario LAN → RB1072(ROS 6.32.3) → WAN, with one interface (ether1) to the WAN and several interfaces to the LAN (192.168.0.0/24).

I do queuing using the follwing lines:
/ip firewall mangle
add action=mark-packet chain=prerouting dst-address-list=6144kbps new-packet-mark=6144kbps_DOWN passthrough=no
add action=mark-packet chain=prerouting src-address-list=6144kbps new-packet-mark=6144kbps_UP passthrough=no
/queue type
add kind=pcq name=6144kbps_DOWN pcq-classifier=dst-address pcq-limit=40 pcq-rate=6144k pcq-total-limit=100k
add kind=pcq name=6144kbps_UP pcq-classifier=src-address pcq-limit=40 pcq-rate=6144k pcq-total-limit=100k
/queue simple
add name=6144kbps_DOWN packet-marks=6144kbps_DOWN queue=default-small/6144kbps_DOWN target=192.168.0.0/24
add name=6144kbps_UP packet-marks=6144kbps_UP queue=default-small/6144kbps_UP target=ether1

This work pretty well on 8000 users.

Recently I needed to change my uplink, so I cannot use anymore the interface as target. So, I put 192.168.0.0/24 as target for the UPLOAD. That didn’t work. Is this a normal behaviour?
I solved my upload like this:
/queue simple
add name=6144kbps_UP packet-marks=6144kbps_UP queue=6144kbps_UP/default-small target=192.168.0.0/24

I would like to know why can’t I use the LAN network as target in this scenario.

Thanks.