This should not be a duplicate of
MC-64118 as this report here describes the bug that it is possible to open a world two or more time with the same instance of Minecraft which leads to a crash
MC-64118 describes all the resulting bugs and crashs of a overloaded world)
First of all I know this could be "Invalid" as Minecraft gets so overloaded, but the bug I am describing here relates to the bug that before entering the world you see the menu screen for a moment
When you open the attached world (world with layer of tnt which explodes), the game will "stop" loading the world, so you return to the menu screen and it said in the development console "Loading 76%" and then you are able to "open" the world again which will lead to a crash at the end.