qt_generate_deploy_app_script seems to not install a bunch of X11 runtime dependencies. I verified they are being read with lsof, and they aren't getting installed into the lib folder.

libxcb-cursor.so.0
libxcb-icccm.so.4
libxcb-keysyms.so.1
libxcb-randr.so.0
libxcb-shape.so.0
libxcb-sync.so.1
libxcb-xfixes.so.0
libxkbcommon-x11.so.0

libxcb-image.so.0 # linked by libxcb-cursor.so.0
libxcb-render.so.0 # linked by libxcb-render-util.so.0
libxcb-render-util.so.0 # linked by libxcb-cursor.so.0
libxcb-shm.so.0 # linked by libxcb-image.so.0
libxcb-util.so.1 # linked by libxcb-image.so.0
libxcb-xkb.so.1 # linked by libxkbcommon-x11.so.0