My hospital and Covid insurance was for one year starting 01 dec 2020 and arrived Swampy 11 December. Several times during document checks was I warned my authorization to stay would not be for 365 days, yes I can calculate....thus until 30 nov 2021.
Be sure to have at least one copy of all your documents.
be smart and check airlines departures and arrivals. I followed Bangkok arrivals and departures for weeks.did this for LH, Swiss, Austrian, Emirates, Etihad and Turkish. Did not see any cancellations. Seems you are not that smart...