It’s difficult to see, even though I’ve zoomed in quite a lot! The border, with <s-thumbnail size="small-200"> - seems to be ‘inside’ the image.
This only appears to happen in Admin extensions and not in App home
Wow nice find @bkspace! I can’t imagine how you came across that 
I was able to replicate this issue, so I’ll look into getting this addressed on our end. Thanks for reporting this to us. I’ll update you here once we ship a fix.
I suppose it’s one of those rare moments where being a perfectionist helps 
@bkspace this issue was resolved in the latest update. More on that here: April 29, 2026 Updates to the Admin Polaris Library.
But is it really resolved? Is that version back in action now, since it was undeployed because of numerous bugs?
The fix isn’t active right now because we had to roll back the latest Polaris patch. We’ll provide an update here once it’s back up and running: