Describe the bug
Every time I try to remove a bookmark (by clicking on the little 'x') the bookmark is remove from the list. After logout and login, the bookmark is still there and a new bookmark appears. The boommark is named 'Symbol(lit-nothing)' (see attached screenshot).

To Reproduce
Steps to reproduce the behavior:

1. Go to 'Groupchats-Bookmarks'
2. Click on the little 'x' to confirm removal of bookmark
3. Confirm removal of bookarm in dialog
4. Log out of converse
5. Log in
6. Go to 'Groupchats-Bookmarks'

Expected behavior
The bookmark is supposed to be removed permanently removed even after logout and login.

Screenshots

Environment (please complete the following information):

• Desktop
• Browser Edge Chromium
• Converse.js version v11.0.1

Additional context
Using ejabberd 25.08