GTK3: wrong icon is used for spinbutton decrease value

Steps to reproduce

1. Use Breeze icon theme version 6.6.0
2. Use an app that shows a spinbutton widget
3. Look at spinbutton

Current behavior

The - icon becomes an X instead of -

Expected outcome

The icon stays a - sign, as it is with GTK4

Version information

• gtk3 1:3.24.43-4
• Artix Linux Plasma OpenRC edition (Plasma version: 6.1.5)
• Wayland (KWin)

Additional information

Related issue with developer comment: https://bugs.kde.org/show_bug.cgi?id=494086