Coronavirus in Czechia: Changes in Arrivals of non-EU Citizens

Are you a student from a non-EU country and not sure if you will be allowed to enter the country for next semester starting in September 2020? Can you leave the Czech Republic for the summer holidays and come back? And what about those who are already back in their homeland? Once the COVID-19 pandemic spread into the Czech Republic, everything came to a halt and borders were closed so no one could get in or out without a good reason. And even then travelling was essentially impossible for a couple of weeks. Now there are updates regarding the arrivals of foreigners from non-EU countries and extensions of long-term residence permits.