A Bug is stopping me from seeing my older worlds.

a bug is topping me from accessing my old worlds it may have something to do with the fact that I have 2119 worlds but is really annoying because many of my projects are lost to it and I cant see them again I can only realistically play twenty worlds but 21 are accessible and whenever I want to play a new world I have to lose one forever. The bug did become mildly better in 1.15( I think ) allowing me to access all of my worlds but it then soon returned i would like it fixed as it has caused me so much inconvenience. I have said it was version 1.20.72 but it also happened in older versions too, I personally have no idea when it started.

Kind Regards,
DragonXD11