Rice rusks for 6 month old

I gave my 6 month old a rice rusks and he loved the taste of it so much he started shoving it into his mouth and breaking off pieces of it instead of just chewing on it until it dissolved. He ended up coughing a little which scared me (choking) and I got freaked out and took it from him and then he got really upset because he liked them.

Is there a choking hazard for these? I even tried one myself and they dissolve very quickly but I’m afraid he’s going to try biting big pieces off again and swallow it before it’s dissolved.

Anyone else have any trouble with these? He sits up by himself, has been on solid baby food for around 6 weeks now, and is almost crawling. I figured he was developed enough for them but now I’m thinking about waiting another month or two