You might want to launch with FREI0R_PATH set:

FREI0R_PATH=/usr/lib/aarch64-linux-gnu/frei0r-1 flowblade

or rather, when you're on wayland:

GDK_BACKEND=x11 FREI0R_PATH=/usr/lib/aarch64-linux-gnu/frei0r-1 flowblade
