With IntelliJ 2023.1.1 and Gradle 8.1.1. I get an

java.lang.UnsupportedOperationException

when I try to debug a test. The reason is the code generated by Intellij: ijresolver.gradle:

forkedTask.jvmArgs ("-javaagent:${kotlinxCoroutinesCoreJar?.absolutePath}", "-ea")

. Didn't change a recent release of Gradle setting the jvmArgs?