PIT is generating equivalent mutations

[zsombor-balogh-dt]

Hi,

I noticed that Pitest generated a few false mutants, which are equivalent to the original source code, and as a result, they survived. I found a similar previous issue: #497. However, it seems that in certain cases, the fix doesn’t work, or I might be missing some configurations.
Currently using 1.15.0 version with gradle.

  public boolean example(int maxSize, Duration maxAge) {
    lock.readLock().lock();
    try {
      int size = elements.size();
      if (size == 0) {
        return false; // -> replaced boolean return with false for com.example.Example::example → SURVIVED

      } else if (size >= maxSize) {
        return true; // -> replaced boolean return with true for com.example.Example::example → SURVIVED

      } else {
        long elapsedNanos = ticker.read() - timeOfLastReset;
        return elapsedNanos >= maxAge.toNanos();
      }

    } finally {
      lock.readLock().unlock();
    }
  }
}

Is there a config missing at our side or is it a known bug?