flipped textures with particleGPU example

i’ve found some strange behavior with the particleGPU from the palette.
if i use a custom texture on the particles, set to face camera, sometimes the particle is flipped on the x axis.
this seems to be related to the particle size. if the particle size is below a certain point, the textures are oriented all the same. if the size is above that point, the texture are randomly flipped along the x axis. the number where this changes seems to be different depending on the texture. i think this happens with the built in textures too, but it is hard to tell. i put the leaves size above 0.2 and started seeing some flipped leaves.
also, the number at which the behavior changes seems to change too. if i sneak up on it with small gradual increases, i can get to a larger size before it starts flipping. this could be my imagination.
i’ve tested this on windows with a commercial license and osx with a non-commercial license, both the current version of 099.
attached is a sample toe with an up arrow texture from the internet.
particleGPUtextureFlip.toe (513 KB)