1. create a bridge domain:
PUT /restconf/config/v3po:vpp/bridge-domains
{"bridge-domains": {"bridge-domain": [{*"name": "bd-01"*}]}}

2. assign an interface to it:
"PUT /restconf/config/ietf-interfaces:interfaces
{"interfaces": {"interface": [{"name": "GigabitEthernet0/8/0", "v3po:l2": {*"bridge-domain": "bd-01"*}, "enabled": false, "type": "iana-if-type:ethernetCsmacd"}]}}

3. remove the bridge domain:
PUT /restconf/config/v3po:vpp/bridge-domains
{"bridge-domains": {"bridge-domain": []}}

After step 3 the bridge domain assignment remains in v3po:l2 node of interface config. This does not reflect operational data, and may also interfere with further bridge domain use.

I suggest either making it impossible to remove BDs with interfaces assigned, or cleaning up the assignments as part of the BD delete operation.