netflow on pppoe interface not working

[bsiege]

• I have read the contributing guide lines at https://github.com/opnsense/core/blob/master/CONTRIBUTING.md
• I am convinced that my issue is new after having checked both open and closed issues at https://github.com/opnsense/core/issues?q=is%3Aissue

maybe a return of [https://github.com//issues/4696]

error pppoe1: cannot create netflow node for pppoe1

Steps to reproduce the behavior:

restart netflow via /usr/local/etc/rc.d/netflow restart

setup igc3
setup vlan02
setup pppoe1 [egress only]
ngctl: send msg: No such file or directory
error pppoe1: cannot create netflow node for pppoe1

# ngctl list
There are 23 total nodes:
  Name: ngctl81970      Type: socket          ID: 00000143   Num hooks: 0
  Name: mpd17989-lso    Type: socket          ID: 00000003   Num hooks: 1
  Name: mpd17989-cso    Type: socket          ID: 00000004   Num hooks: 0
  Name: mpd17989-eso    Type: socket          ID: 00000005   Num hooks: 0
  Name: ng0             Type: iface           ID: 00000006   Num hooks: 2
  Name: mpd17989-wan    Type: ppp             ID: 00000007   Num hooks: 4
  Name: mpd17989-wan_link0-lt Type: tee             ID: 00000008   Num hooks: 2
  Name: igc0            Type: ether           ID: 0000000a   Num hooks: 1
  Name: igc1            Type: ether           ID: 0000000b   Num hooks: 0
  Name: igc2            Type: ether           ID: 0000000c   Num hooks: 0
  Name: igc3            Type: ether           ID: 0000000d   Num hooks: 2
  Name: vlan01          Type: ether           ID: 0000000e   Num hooks: 0
  Name: vlan02          Type: ether           ID: 0000000f   Num hooks: 2
  Name: vlan03          Type: ether           ID: 00000010   Num hooks: 0
  Name: vlan04          Type: ether           ID: 00000011   Num hooks: 0
  Name: netflow_igc3    Type: netflow         ID: 0000012c   Num hooks: 3
  Name: ksocket_netflow_igc3 Type: ksocket         ID: 00000132   Num hooks: 1
  Name: mpd17989-stats  Type: socket          ID: 00000036   Num hooks: 0
  Name: netflow_vlan02  Type: netflow         ID: 00000137   Num hooks: 3
  Name: <unnamed>       Type: socket          ID: 0000003a   Num hooks: 0
  Name: <unnamed>       Type: pppoe           ID: 0000003b   Num hooks: 2   <==========
  Name: mpd17989-wan-mss Type: tcpmss          ID: 0000003c   Num hooks: 2
  Name: ksocket_netflow_vlan02 Type: ksocket         ID: 0000013d   Num hooks: 1

Expected behavior

Working netflow on pppoe
or
Visible error message in webinterface during configuration. (It seems i did not realized this for some time.)