Before hotfix 11 Steam would correctly detect the DualSense controller I use and show me Playstation glyphs, even if I had enabled Steam input support.
Since hotfix 11 however, when Steam Input support is enabled, the game keeps defaulting to Steam Input and therefore showing Xbox glyphs. It also keeps throwing 'controller not found' messages at random, interrupting play.
I fixed this by disabling Steam Input for Playstation controllers in the Steam/settings/controller menu. This both re-enabled the Playstation glyphs and stopped the error messages.
Nothing major but perhaps it's useful to others who are experiencing this problem or maybe important to devs diagnosing the current problems reported by controller users more widely.