onCompletion.onCompleteOnly().log() is invoked even when Camel fails the routing

Issue

Camel route

    @Override
    public void configure() {
    rest("api")
            .get("/download")
            .consumes("application/json")
            .produces("application/octet-stream")
            .to("direct:send")
        ;

        from("direct:send")
            .onCompletion().onCompleteOnly()
                .log("onCompletion()")
            .end()
            .process(exchange -> {
                Path filePath = Paths.get("rhaf-camel-spring-boot-4.4.0.CS8-src.zip");
                exchange.getIn().setBody(filePath.toFile());
            })

            .setHeader("CamelHttpResponseCode", constant(200))
            .setHeader("Content-Disposition", simple("attachment; filename=rhaf-camel-spring-boot-4.4.0.CS8-src.zip"))
    }

Failure test.(Timeout)

$ curl -O -J -X GET -H "Content-Type: application/json" "localhost:8080/api/download" --max-time 0.01
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
curl: (28) Operation timed out after 10 milliseconds with 0 bytes received

Although the client fails to receive a response, .log("onCompletion()") is executed.

2024-10-02T15:07:44.330+09:00  INFO 65048 --- [  XNIO-1 task-2] route1                                   : onCompletion()