This bug has been happening to me since 1.2.13 and its still happening in 1.4.

So when i open a world i get the the screenshot attached. Once it finishes updating i try to open the world but it just goes click and wont open. I have to close the game and reopen it and then i can finally join my world. This happens to every single world i have. I dont have mods or marketplace content or anything. Most of my worlds are purely vanilla only a few have addons and ones that are purely vanilla still have the updating pack thing