Hi @S786 Do you have Samsung Internet version 188.8.131.52 ? This update fixes a Bookmark bug , improves stability and comes with the latest security packages. There also a beta version in development. see more detail in this article https://www.sammobile.com/news/samsung-internet-update-fixes-issue-causing-invisible-bookmarks/
I do not work for Samsung or make Samsung Products but provide independent advice and valuable contributions.
My Device- S21 Ultra 5G ( SM-998B/DS ) CSC= BTU , 12GB/256GB
One Ui 5.0,Android 13 .