If I push following this select group in config:

{
"group-id": 100000,
"buckets": {
"bucket": [
{
"bucket-id": 18,
"weight": 1,
"action": [
{
"order": 0,
"set-field": {
"ethernet-match": {
"ethernet-source":

{ "address": "48:0F:CF:AF:C1:55" }

}
}
},
{
"order": 2,
"output-action":

{ "output-node-connector": "18" }

},
{
"order": 1,
"set-field": {
"ethernet-match": {
"ethernet-destination":

{ "address": "48:0F:CF:AF:10:73" }

}
}
}
]
}
]
},
"group-name": "SelectGroup{FbToFbLinkGroup{src=DC1-FB2,dst=DC3-FB2}}",
"group-type": "group-select"
}

I can see on the wire we are not following the given "order" but the order the info is read from DS. Issue does not happen when I disable single layer serialization.