Mmm, that’s strange.
When I built this sidebar, icons were correctly displayed without the top/bottom crop. At some point, that I can’t recall, I noticed that they were not correctly displayed.
I did delete and reimport fresh icons in WP media library. No success !!!
All these icons are absolutely transparent png, 40×40 pixels with blank margin of 1px on four sides. That’s why I thought it was a conflicting css rule somewhere.
I don’t use any image compression plugin at the moment.
Here is a quick video : https://www.useloom.com/share/f52abcffed3c41509c7f8e8947b53c98
I am not sure where to look at this point.
Thanks for any clue.