Change case changes other things
I used the change case tool and it removed my paragraph centering on my header line and the modified tab points.
Thanks for reporting this issue, Illustrator team really appreciate this.
We are able to reproduce this issue and investigating it further.
Egor Chistyakov commented
Elizabeth, please provide a package of a project (only related parts) that has this problem, including fonts and share it here or email directly at firstname.lastname@example.org with the link to this page.
This would help the team to figure it out.