It is so annoying right I hate the bubbles the issue I'm having with them is unless I close the bubble all together my phone keeps alerting me that there is a unread notification I want chat heads back! My google pixel 2 still has chat heads with Android 11 update why did Samsung stuff this up! Bubbles suck!
I believe that was from a messenger update before Android took over "Bubbles", and it was for Facebook/Messenger Stories. Tapping on that would automatically start playing peoples story updates, I think with a list to choose from.