Integration tests fail due to malformed URL

Tests failed on Ubuntu, verified on two different machines:

KubernetesSuite:

• Launcher client dependencies *** FAILED ***
  java.net.MalformedURLException: no protocol: * http://172.31.46.91:30706
  at java.net.URL.<init>(URL.java:600)
  at java.net.URL.<init>(URL.java:497)
  at java.net.URL.<init>(URL.java:446)
  at org.apache.spark.deploy.k8s.integrationtest.DepsTestsSuite.$anonfun$$init$$1(DepsTestsSuite.scala:160)
  at org.scalatest.OutcomeOf.outcomeOf(OutcomeOf.scala:85)
  at org.scalatest.OutcomeOf.outcomeOf$(OutcomeOf.scala:83)
  at org.scalatest.OutcomeOf$.outcomeOf(OutcomeOf.scala:104)
  at org.scalatest.Transformer.apply(Transformer.scala:22)
  at org.scalatest.Transformer.apply(Transformer.scala:20)
  at org.scalatest.FunSuiteLike$$anon$1.apply(FunSuiteLike.scala:186)

Welcome to
____ __
/ _/_ ___ ____/ /_
\ \/ _ \/ _ `/ __/ '/
/__/ ./_,// //_\ version 3.0.0-SNAPSHOT
/_/

Using Scala version 2.12.8 (OpenJDK 64-Bit Server VM, Java 1.8.0_222)
Type in expressions to have them evaluated.
Type :help for more information.

scala> val pb = new ProcessBuilder().command("bash", "-c", "minikube service ceph-nano-s3 -n spark --url")
pb: ProcessBuilder = java.lang.ProcessBuilder@46092840

scala> pb.redirectErrorStream(true)
res0: ProcessBuilder = java.lang.ProcessBuilder@46092840

scala> val proc = pb.start()
proc: Process = java.lang.UNIXProcess@5e9650d3

scala> val r = org.apache.commons.io.IOUtils.toString(proc.getInputStream())
r: String =
"* http://172.31.46.91:30706
"

Although (no asterisk):
$ minikube service ceph-nano-s3 -n spark --url
http://172.31.46.91:30706

This is weird because it fails at the java level, where does the asterisk come from?

$ minikube version
minikube version: v1.3.1
commit: ca60a424ce69a4d79f502650199ca2b52f29e631