!bookTicker stream pushing only USDT and BUSD pairs updates

Hi, I’m currently looking at !bookTicker stream and it looks like it pushes only best bid/ask updates of pairs containing USDT or BUSD as its quote currency.

I’m a bit confused since the documentation says it “Pushes any update to the best bid or ask’s price or quantity in real-time for all symbols.”

Even if I try to subscribe to some specific symbol’s stream (e.g. ethbtc@bookTicker) I don’t get any updates.

Is it somehow possible to get these updates of best bid/ask price or qty?

did you connect to the testnet?
there is no issue to receive message from stream ethbtc@bookTicker