I am having this issue too but only with Folders/Categories and not with articles themselves.
I am also seeing the red triangle in the bottom right corner showing a bad save. Editing articles is still saving with the green check mark for me.
Step to reproduce:
- Navigate to Articles and World Manager from the nav bar
- Create a sub folder to one of the existing folders
- Open that folder to edit mode and change the title
- try any means to leave and come back: select a different folder and return, refresch the back, view in world, etc
- see that the title reverted.
This is also happening with the content field for folders/catagories.