This is expected behavior

CoroutineSope child coroutine failed, this cause scope cancellation and propagation of error (because block finished exceptionally)

This behavior is default to avoid coroutines leaking: if one of child coroutines failed, it causes cancellation of scope and all other child coroutines

You can wrap code inside of runBlocking to supervisorContext to prevent scope from cancellation and propagation of error, but you responsible now to handle other coroutines manually

Also this issue https://github.com/Kotlin/kotlinx.coroutines/issues/763