I’m having the exact same issue, except for me it’s happening on Nintendo Switch and mobile. I’m starting to get really frustrated at not being able to play a Star Wars pack I payed AU$13 for, as well as the new Simburbia pack, AND any other world I want to play on!
The issue has been getting worse over time, I used to just have to restart Minecraft about 5 TIMES TO GET ON A WORLD BUT NOW IT DOESN’T WORK AT ALL!!!
I’m sorry I just really like playing Minecraft 😞
I’m having this problem on both my Switch and iPad. This bug is not resolved, please fix asap.