Below you can see different renderings for different approaches to svg sprites. It would make sense to switch to stacked rendering because it allows us to re-use the sprite icon in CSS, but we had issues with it in the past. References:

Symbols (currently in use):

xlink:href
href
background-image
content
::before content
::before background

Stacked:

xlink:href
href
background-image
content
::before content
::before background