- Operating system: Windows 10
- Browser and version: Firefox 116.0.3, can also reproduce on chromium (Vivaldi)
The following screenshots are from the icons listing at icons.getbootstrap.com

These icons have fill in places they should not. When clicked on to view larger/details, they display properly, and appear to display properly when embedded as an SVG, but not when using the icon font (see jsfiddle demo of issue)