Qt has been updated to 5.15.9 (in Chum and Chum:testing).
Small issue appeared that was leading to freezing of Qt apps when QT_WAYLAND_RESIZE_AFTER_SWAP
environment variable was set. New Qt-Runner (0.4.0) removes that variable from the environment used by applications running in it. If you use Qt apps via some other compositor (newcompositor), make sure that you don’t have that env var defined (it is by default on SFOS).