1-create prop, select apng, loop infinite. add flag to start and end frame, export motion.
2-Puppet stage + eye, always hide, defualt pin, add motion, uncheck mimic

preview: prop plays, right before it turns off it plays frame 1 again

OK infinite loop seems to be issue

1-create prop, select apng, loop ONCE. add flag to start and end frame, export motion.
2-Puppet stage + eye, always hide, defualt pin, add motion, uncheck mimic

preview: prop plays and stays at last frame never turning off