- Operating system and version: Windows 10 - Browser and version: Latest firefox - A reduced test case: https://codepen.io/hrueger/pen/bGEYxxJ The icon which is added to `form-control` elements with the class `is-invalid`, looks like this on select fields:  See https://codepen.io/hrueger/pen/bGEYxxJ
The icon which is added to

form-controlelements with the classis-invalid, looks like this on select fields:See https://codepen.io/hrueger/pen/bGEYxxJ