I am able to replicate this on 25.11 as well using limiters. In the example below, limiter 0001 is for upload (50Mb) and 00002 is for download (100Mb) - 10.0.5.1 is the gateway.
Without route-to:
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# Limiters
##########
Limiters:
00001: 50.000 Mbit/s 0 ms burst 0
q65537 50 sl. 0 flows (1 buckets) sched 1 weight 1 lmax 0 pri 0 droptail
sched 65537 type FIFO flags 0x1 256 buckets 1 active
mask: 0x00 0xffffffff/0x0000 -> 0x00000000/0x0000
BKT Prot ___Source IP/port____ ____Dest. IP/port____ Tot_pkt/bytes Pkt/Byte Drp
100 ip 10.0.50.50/0 0.0.0.0/0 3 180 0 0 0
00002: 100.000 Mbit/s 0 ms burst 0
q65538 50 sl. 0 flows (1 buckets) sched 2 weight 1 lmax 0 pri 0 droptail
sched 65538 type FIFO flags 0x1 256 buckets 1 active
mask: 0x00 0x00000000/0x0000 -> 0xffffffff/0x0000
50 ip 0.0.0.0/0 10.0.50.50/0 3 180 0 0 0
Schedulers:
00001: 50.000 Mbit/s 0 ms burst 0
sched 1 type WF2Q+ flags 0x1 256 buckets 0 active
mask: 0x00 0xffffffff/0x0000 -> 0x00000000/0x0000
00002: 100.000 Mbit/s 0 ms burst 0
sched 2 type WF2Q+ flags 0x1 256 buckets 0 active
mask: 0x00 0x00000000/0x0000 -> 0xffffffff/0x0000
########
# States
########
vmx1 icmp 9.9.9.9:8 <- 10.0.50.50:1 0:0
age 00:00:02, expires in 00:00:09, 2:2 pkts, 120:120 bytes, anchor 1, rule 84, dummynet pipe (1 2)
vmx0 icmp 10.0.5.99:30653 (10.0.50.50:1) -> 9.9.9.9:8 0:0
age 00:00:02, expires in 00:00:09, 2:2 pkts, 120:120 bytes, anchor 2, rule 78, allow-opts
#######
# Rules
#######
@84 pass in quick on vmx1 inet from any to 9.9.9.9 flags S/SA keep state (if-bound) label "id=1756220433" label "tags=user_rule" label "descr=Test" ridentifier 1756220433 dnpipe(1, 2)
@78 pass out route-to (vmx0 10.0.5.1) inet from 10.0.5.99 to ! 10.0.5.0/24 flags S/SA keep state (if-bound) allow-opts label "descr=let out anything from firewall host itself" ridentifier 1000003711
With route-to:
##########
# Limiters
##########
Limiters:
00001: 50.000 Mbit/s 0 ms burst 0
q65537 50 sl. 0 flows (1 buckets) sched 1 weight 1 lmax 0 pri 0 droptail
sched 65537 type FIFO flags 0x1 256 buckets 1 active
mask: 0x00 0xffffffff/0x0000 -> 0x00000000/0x0000
BKT Prot ___Source IP/port____ ____Dest. IP/port____ Tot_pkt/bytes Pkt/Byte Drp
198 ip 10.0.5.99/0 0.0.0.0/0 29 1740 0 0 0
00002: 100.000 Mbit/s 0 ms burst 0
q65538 50 sl. 0 flows (1 buckets) sched 2 weight 1 lmax 0 pri 0 droptail
sched 65538 type FIFO flags 0x1 256 buckets 1 active
mask: 0x00 0x00000000/0x0000 -> 0xffffffff/0x0000
50 ip 0.0.0.0/0 10.0.50.50/0 29 1740 0 0 0
Schedulers:
00001: 50.000 Mbit/s 0 ms burst 0
sched 1 type WF2Q+ flags 0x1 256 buckets 0 active
mask: 0x00 0xffffffff/0x0000 -> 0x00000000/0x0000
00002: 100.000 Mbit/s 0 ms burst 0
sched 2 type WF2Q+ flags 0x1 256 buckets 0 active
mask: 0x00 0x00000000/0x0000 -> 0xffffffff/0x0000
########
# States
########
vmx1 icmp 9.9.9.9:8 <- 10.0.50.50:1 0:0
age 00:00:02, expires in 00:00:10, 3:3 pkts, 180:180 bytes, anchor 1, rule 84, dummynet pipe (1 2)
vmx0 icmp 10.0.5.99:64595 (10.0.50.50:1) -> 9.9.9.9:8 0:0
age 00:00:02, expires in 00:00:10, 3:3 pkts, 180:180 bytes, anchor 2, rule 78, allow-opts, dummynet pipe (1 2)
#######
# Rules
#######
@84 pass in quick on vmx1 route-to (vmx0 10.0.5.1) inet from any to 9.9.9.9 flags S/SA keep state (if-bound) label "id=1756220433" label "gw=WAN_STATIC" label "tags=user_rule" label "descr=Test" ridentifier 1756220433 dnpipe(1, 2)
@78 pass out route-to (vmx0 10.0.5.1) inet from 10.0.5.99 to ! 10.0.5.0/24 flags S/SA keep state (if-bound) allow-opts label "descr=let out anything from firewall host itself" ridentifier 1000003711
The limiter configuration used (/tmp/rules.limiter) is:
pipe 1 config bw 50Mb queue 25 delay 1 mask src-ip6 /128 src-ip 0xffffffff droptail
sched 1 config pipe 1 mask src-ip6 /128 src-ip 0xffffffff type wf2q+
pipe 2 config bw 100Mb queue 25 delay 1 mask dst-ip6 /128 dst-ip 0xffffffff droptail
sched 2 config pipe 2 mask dst-ip6 /128 dst-ip 0xffffffff type wf2q+
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