Hi there,
I have a problem were adding an IKsolver such as IKTwoBone or BasicIK let’s the last bone disappear. (sadly i don’t have the necassary permissions yet to attach a recording showing the issue)
What i noticed is that for some reason the foot bone takes the same start and end as the lower leg bone and any following bones merge into one and the same position .
This begins to feel like a bug rather like a wrong handling of things.
I can confirm that i adjusted the axis correctly though. In my case that’s -1Y and for the secondary -1Z for the leg.
Also the orientation of each bone has the same flow of direction.
Don’t know if this information is even necessary but the FBX export happened from blender.