Please mention whether you’re on stable, beta, or a different update channel. There’s a good chance most bugs on the stable update channel have been fixed already, so anyone on the beta update can let people know if the bug they’re facing is already fixed.
On beta, the two bugs that annoy me the most are both related to docked play.
The first one is that pressing home + A on a controller to open the QAM will open it for just a moment before opening the full steam overlay instead. It’s acting like it’s counting it as two home presses.
Second one is that every SteamOS update somehow messes up my bluetooth pairing for controllers. The controllers are still listed, but won’t connect. Have to forget them and repair before they’ll work again.