Google is once again testing favicons in the search results snippets near the title of the result. We've seen Google test this last year, in 2013, in 2009 and other times. Here is a more recent screen shot from this year from Ric Rodriguez on Twitter.
I am not sure why Google continues to test it but doesn't release it yet to the public. Maybe Google wants to see if newer tests have a different result?
Here are some more screen shots:
@rustybrick I’m sure you’ve seen before, but spotted icons in SERPs - test was in the UK, if you haven’t. pic.twitter.com/0lYyGOdyPl
— Ric Rodriguez 🍂 (@RicRodriguez_UK) October 9, 2018
Forum discussion at Twitter.