Critical multiple error

(sorry if my english is bad im Brazilian)I was playing in my survival world when suddenly chuncks stoped to load and nearby entities freezed, i tried to walk in those "unloaded" chuncks(i've already walked there before) and i started to fall infinitely I tried some comands like /gamemode creative,spectator /tp to some random corddinates but nothing happened, I tried to get out of the world but 30 minutes later it was still loading i tried close the game by pressing the "x" button but nothing happened, i was forced to open the task manager to close the game, it closed, the launcher havent shown any button to open the crash report, and when ive gone to the crash-reports at .minecraft it still has nothing, when i opened the game again and opened the world and it was in its last save.
the same thing happened again when I was travelling but in another chunck of the world.