Recibe from "emacs -Q":
1. Open the Emacs manual [C-h r].
2. Set a named bookmark in some line of the *info* page [C-x r m f o o RET].
3. Move point to another line and repeat step #2 (using the same name
for the bookmark).

When I do this, I end up seeing two icons in the fringe. See attached
screenshot.
There should be only one icon, since there is only one bookmark set.

I've reproduced this using both GNU/Linux (WSL) and MS-Windows native
port of Emacs.

----
Dani Moncayo

In GNU Emacs 30.0.50 (build 17, x86_64-pc-linux-gnu, GTK+ Version
 3.24.38, cairo version 1.18.0) of 2024-03-24 built on C11-Q8YAKWONJX0
Repository revision: 30b1b0d7cd8e4d46a601e9737350cda970f6bab0
Repository branch: master
Windowing system distributor 'Microsoft Corporation', version 11.0.12010000
System Description: Ubuntu 23.10

Configured features:
CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GSETTINGS HARFBUZZ JPEG
LIBSELINUX LIBXML2 MODULES NOTIFY INOTIFY PDUMPER PNG SECCOMP SOUND
THREADS TIFF TOOLKIT_SCROLL_BARS TREE_SITTER WEBP X11 XDBE XIM XINPUT2
XPM GTK3 ZLIB

Important settings:
  value of $LANG: C.UTF-8
  locale-coding-system: utf-8-unix


-- 
Dani Moncayo