Google Featured Snippets Without Borders - A Bug Or Feature?

I had a few reports yesterday of Google displaying featured snippets but without borders. It seems like a bug to me but who knows, maybe Google is testing borderless featured snippets and search results?

Here is a screen shot of a featured snippet without borders via @DanielHerndler:

Here is how I see it with borders:

Here are more screen shots:

Seeing a no-border display in SERPs, even for the Featured Snippet!
Very neat.

Google, always testing pic.twitter.com/FhYjTeiHoc

— Shalom Goodman (@ShalomGood) August 4, 2020

Recognized a new style for #Google Featured Snippets without border today. Is this new, @rustybrick? #seo pic.twitter.com/FoewP6oV2o

— Daniel Herndler (@DanielHerndler) August 4, 2020

Has to be a bug, right?

Forum discussion at Twitter.