Minecraft Loads but will not generate worlds created after 1.13.0

Minecraft loads and will allow me to the main screen. When i click on play it opens the screen to select world (image attached). When i click on the top named forest glade it will attempt to generate the world but will only show the loading screen and never load (image attached) however if i click on the bottom world created Pre 1.13.0 it will load no issues?