To reproduce:
1. Open Unity and Import the package
2. Choose "Tools->Test->test" from top menu bar
3. Click "Save as" button on TestWindow
4. Click "Import" button on TestWindow
5. Choose a.asset
6. Console will output 18 logs
7. Open NewBehaviourScript.cs, change any code such as adding empty line, save it and close
8. Wait a bit for code to reimport (gear in bottom right stops spinning)
9. Click "Import" button on TestWindow and Choose a.asset
10. Console will only output 9 logs

Reproduced in 5.4.0f3, 5.4.3f1, 5.5.0f3, 5.6.0a5