Tested with:

set service dns dynamic interface eth0.203 service custom host-name 'test.vyos.net'
set service dns dynamic interface eth0.203 service custom login 'vyos'
set service dns dynamic interface eth0.203 service custom password 'vyos'
set service dns dynamic interface eth0.203 service custom protocol 'dyndns2'
set service dns dynamic interface eth0.203 service custom server 'vyos.io'

This also happens on service deletion

Multiple fixes have been placed into the 4.19 series Kernel. Could you please try upgrading to VyOS 1.2.5 or 1.2.6-epa1?

Please use the new get_config_dict() API calls.

I have removed show ip bgp scan for the upcoming 1.2.6 release.

@Viacheslav --verbose is not the issue, it's only used to output the actual "error".

This is no longer compiled as a module but rather statically into the kernel (https://github.com/vyos/vyos-build/blob/current/packages/linux-kernel/x86_64_vyos_defconfig#L188)

I do not have that hardware available, but a possible solution could be the following snippet which could be run on system boot:

We no longer make use of git submodules. Closing as wontfix. Build from source is possible using e.g. our Jenkins CI/CD pipeline library (https://github.com/vyos/vyos-build/tree/current/vars)

@Viacheslav what you think?

This is not a "bug" - we pass any argument to show ip bgp down to FRR.