why not "this bunny is beautiful"? Is it because the זה did not come after ארנב?
It makes me a bad mood if sentenses get marked wrong even they are written correct. It happens too often
For example יפה is not correct because it is written without the 3 points under the letter פ. Why ?
They're called Nikud. It's an error in the app, just ignore it. They are important for pronunciation & while learning, but once you know the language they're unnecessary. They're not used outside of education in secular society.