Uncaught exception is thrown two times from a coroutine scope in instrumentation/robolectric tests

[mkar-dev]

I've stumbled onto weird behaviour regarding coroutineScope in instrumentation tests
I might be misunderstanding something about threads or something else, but it seems an undesired behaviour for me right now
It isn't occurring in a simple unit test (not android instrumentation nor robolectric), however

Current behaviour:

• UncaughtExceptionHandler is called twice with same exception

Expected Behaviour:

• UncaughtExceptionHandler is called only once per every exception

EDIT:

I just realised it doesn't even require the usage of Thread.uncaughtExceptionHandler
The exception is just thrown two times regardless of that handler presence

Code sample:

@RunWith(AndroidJUnit4::class)
class ExampleInstrumentedTest {

    @Test
    fun uncaughtExceptionDoubling() = runBlocking{
        Thread.setDefaultUncaughtExceptionHandler { t, e ->
            println("Handling stuff: $e")
        }

        CoroutineScope(Dispatchers.Unconfined).launch {
            throw IllegalStateException("Notice me")
        }.join()
    }
}

Output:

--------- beginning of main
11-16 05:27:12.952 10156  7902  7918 I System.out: Handling stuff: java.lang.IllegalStateException: Notice me
11-16 05:27:12.952 10156  7902  7918 I System.out: Handling stuff: java.lang.IllegalStateException: Notice me
11-16 05:27:12.952 10156  7902  7918 I TestRunner: finished: uncaughtExceptionDoubling(com.example.doubledexceptionhandling02.ExampleInstrumentedTest)
--------- beginning of kernel

Gradle dependencies (rest is standard generated by Android studio, I can provide rest if necessary)

  implementation 'androidx.core:core-ktx:1.7.0'
  implementation 'androidx.appcompat:appcompat:1.3.1'
  implementation 'com.google.android.material:material:1.4.0'
  implementation("org.jetbrains.kotlinx:kotlinx-coroutines-android:1.5.0")
  testImplementation 'junit:junit:4.+'
  testImplementation 'org.jetbrains.kotlinx:kotlinx-coroutines-test:1.5.0'
  androidTestImplementation 'androidx.test.ext:junit:1.1.3'
  androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'

Kotlin plugin version:

org.jetbrains.kotlin:kotlin-gradle-plugin:1.5.31

[qwwdfsad]

Should be fixed with #3056