Next coroutine suspends at the very beginning

suspend_next_coroutines.kt

suspend fun <T> synchronized(block: suspend () -> T): T {
      val thisJobId = id.getAndIncrement()
      while (isInsideCriticalSection) {
          suspendCoroutine { cont -> // <-- suspending call
              suspendedJobs[thisJobId] = cont
          }
          suspendedJobs.remove(thisJobId)
      }
      ...
}