Whenever i add a pargraph- or character styles to a CC library it simply wont add it. It says that the character - or paragraph style is not supported in Indesign. This happens with new and old libraries, character- and paragraph styles just dissapeared in older libraries. This makes the libraries unworkable.

Adobe indesign 18.5

To reproduce:
- add a character - or paragraph style to the library
- watch it disappear from the library

expected result:
- the character- or paragraph is added to the library, so it can happily be used for the book and all it's chapters we are currently making

actual result:
- we can't use shared character - and paragraph styles from the library