AHC causes uncleanShutdown error on server side.

I have a server that is functionally similar in setup to hummingbird-examples/http2, when I use async-http-client to make a request with a command line program that exits after the request, humming bird reports this error:

[HummingbirdHTTP2] Error handling inbound connection for HTTP2 handler: uncleanShutdown

I do not see the same error when using curl:

curl --cacert certs/ca.crt --http2 -v https://localhost:8043/healthcheck

    var tlsConfiguration: TLSConfiguration {
        get throws {
            let certificateChain = try NIOSSLCertificate.fromPEMFile(self.certificateChain)
            var tlsConfiguration = TLSConfiguration.makeClientConfiguration()
            tlsConfiguration.trustRoots = .certificates(certificateChain)
            #if os(macOS)
            tlsConfiguration.certificateVerification = .none
            #else
            // not supported with Network.framework
            tlsConfiguration.certificateVerification = .noHostnameVerification
            #endif
            return tlsConfiguration
        }
    }

relevant code in the run() async throws method of an AsyncParsableCommand:

        var clientConfig = HTTPClient.Configuration()
        clientConfig.tlsConfiguration = try self.tlsConfiguration
        try await HTTPClient.withHTTPClient(configuration: clientConfig) { client in
            var request = HTTPClientRequest(url: url.absoluteString)
            request.method = .POST
            request.headers.add(name: "content-type", value: "application/json")
            request.headers.add(name: "content-length", value: "\(payloadData.count)")
            request.body = .bytes(payloadData)
            let response = try await client.execute(request, timeout: .seconds(30))
            let body = try await response.body.collect(upTo: 10 * 1024 * 1024)
        }

I've tried many variations that all execute await client.shutdown() before exiting and they all result in this error. From what Cory says here: https://forums.swift.org/t/niossl-spurious-uncleanshutdown-error/53031/3 it seems like AHC isn't sending CLOSE_NOTIFY on shutdown?

Reproduce the report using the hummingbird-examples/http2 server and the AsyncParsableCommand run() async throws client code shown, then compare it with the curl request. Trace client shutdown and TLS handling around HTTPClient.withHTTPClient and client.shutdown(), focusing on whether the connection sends CLOSE_NOTIFY. Done means the request can complete and the command can exit without the server reporting uncleanShutdown.