On main, `InboundHandlerTests.testLogsSlowInboundProcessing` throws the following exception during processing:

    java.lang.NullPointerException: Cannot read field "length" because "this.slice" is null
	    at org.elasticsearch.common.bytes.BytesReferenceStreamInput.readVInt(BytesReferenceStreamInput.java:83)
	    at org.elasticsearch.common.io.stream.FilterStreamInput.readVInt(FilterStreamInput.java:60)
	    at org.elasticsearch.common.io.stream.StreamInput.readArraySize(StreamInput.java:1307)
	    at org.elasticsearch.common.io.stream.StreamInput.readString(StreamInput.java:428)
	    at org.elasticsearch.tasks.TaskId.readFromStream(TaskId.java:70)
	    at org.elasticsearch.transport.TransportRequest.<init>(TransportRequest.java:37)
	    at org.elasticsearch.transport.TransportHandshaker$HandshakeRequest.<init>(TransportHandshaker.java:184)
	    at org.elasticsearch.transport.TransportHandshaker.handleHandshake(TransportHandshaker.java:89)
	    at org.elasticsearch.transport.InboundHandler.handleRequest(InboundHandler.java:218)
	    at org.elasticsearch.transport.InboundHandler.messageReceived(InboundHandler.java:118)
	    at org.elasticsearch.transport.InboundHandler.inboundMessage(InboundHandler.java:97)
	    at org.elasticsearch.transport.InboundHandlerTests.testLogsSlowInboundProcessing(InboundHandlerTests.java:315)
	    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
	    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	    at java.base/java.lang.reflect.Method.invoke(Method.java:568)

This doesn't actually cause the test to fail, as the test is not checking for correct processing, and a response is returned, albeit an error response. However, with the changes introduced by #93376, this exception does cause that test to fail, as it changes the error behaviour to just close the channel, which fails the test if the close happens before the 'slow response' message was logged.
server/src/test/java/org/elasticsearch/transport/InboundHandlerTests.java
(request, channel, task) -> channelCaptor.set(channel),
            ThreadPool.Names.SAME,
            false,
            true,
            Tracer.NOOP
        );
        requestHandlers.registerHandler(registry);
        handler.inboundMessage(channel, new InboundMessage(null, true));
        if (channel.isServerChannel()) {
            BytesReference ping = channel.getMessageCaptor().get();
            assertEquals('E', ping.get(0));
            assertEquals(6, ping.length());
        }
    }
    public void testRequestAndResponse() throws Exception {
        String action = "test-request";
        int headerSize = TcpHeader.headerSize(version);
        boolean isError = randomBoolean();
        AtomicReference<TestRequest> requestCaptor = new AtomicReference<>();
        AtomicReference<TestResponse> responseCaptor = new AtomicReference<>();
        AtomicReference<Exception> exceptionCaptor = new AtomicReference<>();
        AtomicReference<TransportChannel> channelCaptor = new AtomicReference<>();
        long requestId = responseHandlers.add(new Transport.ResponseContext<>(new TransportResponseHandler<TestResponse>() {
            @Override
            public void handleResponse(TestResponse response) {
                responseCaptor.set(response);
            }
            @Override
            public void handleException(TransportException exp) {
                exceptionCaptor.set(exp);