Tolerate send_open() at Closed state?

I am having some issue with tunneling TCP using h2, it aborts the connection after the server (usually speedtest servers) resets the connection and h2 trying to send_open().

Not sure if this should be tolerated by h2 or to be handled by my code. I tried to do an early return with a Closed state and it seems to fix my problem.

    pub fn send_open(&mut self, eos: bool) -> Result<(), UserError> {
        let local = Streaming;

        if matches!(self.inner, Inner::Closed(_)) {
            return Ok(());
        }

https://github.com/hyperium/h2/blob/77be6648e5c6da22f51e5049347496335a032288/src/proto/streams/state.rs#L91-L129

Any suggestions on a proper workaround?

Start in src/proto/streams/state.rs around send_open(), especially the Closed-state handling, and trace how a reset leads to this call. Determine whether send_open() should tolerate Closed or whether callers must handle it; done means an agreed behavior with the corresponding regression coverage or workaround documented.