BUG ZR - CSAPI - Participants always empty

whenever i do a call to

zcommand call listparticipants

i always have no Participants

{
“ListParticipantsResult”: ,
“Status”: {
“message”: “”,
“state”: “OK”
},
“Sync”: true,
“topKey”: “ListParticipantsResult”,
“type”: “zCommand”
}