Hardcore's delete world is abnormal

When I click delete the world after death in Hardcore Mode,the game returns to the main interface,but what I still hear is the sound in the game.When I click on Options and press ESC, I will go back to the interface of death again.It seems that the server is not shut down.This problem exists in 1.9, 1.10.2, 1.11.2, 1.12.2, 1.13.1 and now 1.14.3.Another 1.14.3 back to the main interface is not normal.I tried to delete the save in .minecraft\saves\ and found that the folder was still occupied.This problem should still exist in 1.14.4.