When I create a VxLAN interface:
PUT /restconf/config/ietf-interfaces:interfaces
{"v3po:vxlan":

{"encap-vrf-id": 0, "src": "192.168.0.2", "dst": "192.168.0.3", "vni": 88}

,
"type": "v3po:vxlan-tunnel",
"name": "vx_tunnel_test"
}
And then remove it:
DELETE /restconf/config/ietf-interfaces:interfaces/interface/vx_tunnel_test

The tunnel is removed from VPP, but Honeycomb returns error 500: missing writer. From the log it seems like the DELETE operation times out, then Honeycomb attempts to revert the operation and fails with missing writer.

Included trace level log.