Hardcore Minecraft "delete world" button causing grey main screen and grey-black screen upon new world creation

I was playing Hardcore for the first time in at least 2-3 years, and i die (alot, cause well, i'm not completely prepared for long game sessions without dying). So i die, press delete world, and the main screen has a grey background, and creating a new world causes dark-grey/black screen that cannot be interacted with until game is forcefully closed