Trade_updates webstream does not listen to trail stop orders

Hello,

I did some tests to realize that trading_updates web stream with URL, wss://paper-api.alpaca.markets/stream does not seem to capture new events in the name of trailing stop orders.

Example:
set_trial_stop2 = api.submit_order(
symbol=‘BFT’,
side=‘sell’,
type=‘trailing_stop’,
qty=str(5),
time_in_force=‘gtc’,
trail_percent = str(2),
)

the above does not push out a stream. On the contrary, if I submit a stop order as below:

ask_price = api.get_last_quote(symbol).askprice
set_limit_stop2 = api.submit_order(
symbol=‘BFT’,
side=‘sell’,
type=‘stop’,
qty=str(2),
time_in_force=‘day’,
stop_price = str(ask_price*(1-40/100)),
)

pushes out:

b’{“stream”:“trade_updates”,“data”:{“event”:“new”,“order”:{“asset_class”:“us_equity”,“asset_id”:“07ee7a71-197b-4091-9b44-b0bd8cc37180”,“canceled_at”:null,“client_order_id”:“1d4052bd-1a37-469f-8c50-3b746affc9c1”,“created_at”:“2020-12-14T18:46:11.198765Z”,“expired_at”:null,“extended_hours”:false,“failed_at”:null,“filled_at”:null,“filled_avg_price”:null,“filled_qty”:“0”,“hwm”:null,“id”:“69978f81-6cc7-4b67-88bb-e5b1b7e1eda6”,“legs”:null,“limit_price”:null,“order_class”:"",“order_type”:“stop”,“qty”:“2”,“replaced_at”:null,“replaced_by”:null,“replaces”:null,“side”:“sell”,“status”:“new”,“stop_price”:“5.95”,“submitted_at”:“2020-12-14T18:46:11.196592Z”,“symbol”:“BFT”,“time_in_force”:“day”,“trail_percent”:null,“trail_price”:null,“type”:“stop”,“updated_at”:“2020-12-14T18:46:11.217363Z”}}}’