Hey there,
I have a Skeleton Animation with a Skeleton Utility on it, and then a child ParticleSystem on one of the bones.
As you can see in the attachment, it's not working when I flip the sprite. The position seems to work fine, but it's not rotated correctly.

I've tried messing with it myself, to no avail. I looked around the forums as well and it seems like it's a problem with Unity? Is that still the case?
It's worth noting: I'm using an older version of the runtimes. Not sure what version, I don't see any version numbers on the source.
Thanks!