dialTimeout not working

I have this

const etcd = new Etcd3({
                    credentials: { rootCertificate: fs.readFileSync(etcdCertFile) },
                    dialTimeout: 5000,
                    hosts: "hostname:port"
                })
const cfg = await etcd.get("/cfg").string()

I would expect it to throw an exception after 5 seconds if the host is not reachable.

Instead it seems there are 3 connections tries, lasting about 21 seconds each, after which a GRPCUnavailableError occurs. The dialTimeout can be changed, but it doesn't matter.

Is there another way to configure the connection timeout?

BTW, afaict, the example of "defaultCallOptions" for 10 second deadline is wrong - it shouldn't just return a number, but something like { deadline: ... }.

No file or test is named. Start at the Etcd3 constructor and the defaultCallOptions configuration, then reproduce the unreachable-host case with dialTimeout set; done means the timeout behavior is corrected or the supported connection-timeout configuration and example are clearly established.