Traffic shapping with HFSC

I’m trying to configure qos shaper-hfsc under Vyos. With the following configuration i’m getting an error that I don’t understand. I’m quite positive that this error is incorrect, but maybe I missing something.

The error pops-up when the policy is connected to the interface.

Policy configuration which commits fine.

set qos policy shaper-hfsc wan_ingress bandwidth '400mbit'
set qos policy shaper-hfsc wan_ingress class 10 linkshare m2 '200mbit'
set qos policy shaper-hfsc wan_ingress class 10 match downloadtest ip source address '194.71.11.163'
set qos policy shaper-hfsc wan_ingress default linkshare m2 '400mbit'

After connecting the policy to the interface with:

set qos interface ifb0 egress wan_ingress

Commit fails with error:

Bandwidth must be defined for policy "wan_ingress" class "10"!

Is there any documenation available for this section? I could only find documenation about traffic-shaping, but that is for Vyos version 1.3

Vyos version: 1.4-rolling-202305130317

Any idea?