stream send behavior after stream send is shutdown

The current code pretends `Ok` when pushing more data to a stream send after it is shutdown:

https://github.com/cloudflare/quiche/blob/fd5e028e1ec29c964d79ce8fb5bf623669cebfc8/src/stream.rs#L925

I bumped into a case, where it seems causing a problem that consumes the send capacity and impacts other streams. I was wondering what was the rationale of not returning error? And is this a known issue, or maybe I missed something?