It looks like https://vyos.dev/T6972 introduced a bug that makes it so you cannot commit interface changes when an interface has a dynamic IPv6 address and the user is trying to remove it from being a DHCP client
```
bitplumber@vyos# run show interfaces
Codes: S - State, L - Link, u - Up, D - Down, A - Admin Down
Interface IP Address MAC VRF MTU S/L Description
----------- --------------------------------- ----------------- ------- ----- ----- -------------
eth0 172.233.33.164/24 f2:3c:93:d7:f5:8a default 1500 u/u
2600:3c0e::f03c:93ff:fed7:f58a/64
yzguy@router.ams1# delete interfaces ethernet eth0 address dhcp
yzguy@router.ams1# compare
[interfaces ethernet eth0]
- address "dhcp"
yzguy@router.ams1# commit
Traceback (most recent call last):
File "/usr/libexec/vyos/services/vyos-configd", line 139, in run_script
script.apply(c)
File "/usr/libexec/vyos//conf_mode/interfaces_ethernet.py", line 336, in apply
e.update(ethernet)
File "/usr/lib/python3/dist-packages/vyos/ifconfig/ethernet.py", line 532, in update
super().update(config)
File "/usr/lib/python3/dist-packages/vyos/ifconfig/interface.py", line 1663, in update
self.del_addr('dhcp')
File "/usr/lib/python3/dist-packages/vyos/ifconfig/interface.py", line 1280, in del_addr
self.set_dhcp(False)
File "/usr/lib/python3/dist-packages/vyos/ifconfig/interface.py", line 1430, in set_dhcp
self.del_addr(address)
File "/usr/lib/python3/dist-packages/vyos/ifconfig/interface.py", line 1285, in del_addr
self._cmd(f'{netns_cmd} ip addr del {addr} dev {self.ifname}')
File "/usr/lib/python3/dist-packages/vyos/ifconfig/control.py", line 64, in _cmd
return cmd(command, self.debug)
^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/lib/python3/dist-packages/vyos/utils/process.py", line 155, in cmd
raise OSError(code, feedback)
FileNotFoundError: [Errno 2] failed to run command: ip addr del 2600:3c0e::f03c:93ff:fed7:f58a dev eth0
returned:
exit code: 2
```
You must pass an IP with the CIDR to the `ip del` command or it will error because the address cannot be found
```
yzguy@router.ams1# sudo ip addr del 2600:3c0e::f03c:93ff:fed7:f58a dev eth0
Error: ipv6: address not found.
[edit]
yzguy@router.ams1# sudo ip addr del 2600:3c0e::f03c:93ff:fed7:f58a/64 dev eth0
[edit]
```
The comment above the code specifically is
```
# We will force removal of any dynamic IPv4 address from the interface
```
So it may also have been meant to only deal with IPv4 addresses, but since it's not looking at specifically `inet` addresses, eg `address_info['family']` it is also looking at IPv6 addresses