It only happens in my current project. The crazy thing about this is that all other changes are saved correctly. If I change further things these are saved correctly.
Another information which could help is that my character blueprints is inherited from another BaseCharacter blueprint where the meshes are defined in the first place.
If you migrate the blueprint and related assets to a new project will the error still occur? Do you have any blueprints or code that are hard setting values within the blueprint that is experiencing the error?
We have not heard from you in several days. I am marking this as answered for tracking purposes. If you are still experiencing this error, please comment with the requested information.