Cannot load and 1.17 Worlds or World Copies

Ever since I started playing Minecraft 1.18 today I have run into nothing but problems... none of my old 1.17 and before worlds have been working today they have all been either corrupted or I have not be willing to try them out... seeing as it is the first day of this and these update days can be bumpy sometimes, this is crazy. I thankfully loaded a creative copy of my three year old survival world to find purple and black blocks (and that was after I spent hours trying to load up a copy) I have also been told that there is no space for my world to load ( however there have been other people who have brought that up) 

Please fix this issue of 1.17 and pre worlds not working and just corrupting and failing.