When run make test, it occur with the following message. Mill version is 0.10.8.

[bigdot123456]

./mill -i ventus.tests.testOnly play.hello_test2
[10/315] mill.scalalib.ZincWorkerModule.worker
1 targets failed
mill.scalalib.ZincWorkerModule.worker java.lang.ClassNotFoundException: mill.scalalib.worker.ZincWorkerImpl
java.base/java.net.URLClassLoader.findClass(URLClassLoader.java:445)
mill.api.ClassLoader$$anon$1.findClass(ClassLoader.scala:47)
java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:587)
java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:520)
mill.scalalib.ZincWorkerModule.$anonfun$worker$3(ZincWorkerModule.scala:58)
Makefile:30: recipe for target 'test' failed

Java version:
openjdk version "17.0.7" 2023-04-18
OpenJDK Runtime Environment (build 17.0.7+7-Ubuntu-0ubuntu118.04)
OpenJDK 64-Bit Server VM (build 17.0.7+7-Ubuntu-0ubuntu118.04, mixed mode, sharing)

[bigdot123456]

use ubuntu 20.04 is ok. ubuntu 18.04 is not good.
It's very strangely for OS cause.