I've come across a troubling issue that I have not been able to solve. When trying to export an animated FBX file from Blender, the resulting file produces weird glitches in the foot bones of the character rig, despite the animation playing perfectly fine inside Blender initially.
I have included a link to a video of the rig with a ultra-simplified box-type mesh for an example. You can see the animation plays fine in Blender, but when you export the FBX and then re-import the FBX file you will see the feet glitching wildly. This behavior was first discovered inside UE4, but it is identical inside Blender after you import the FBX and watch the animation.
Thanks so much for your time in looking into this. If this behavior in the FBX can somehow be avoided by modifying the rig, please let me know. I have tried exporting over 30 times with different settings in both the FBX exporter and the rig itself, but have not been able to fix this.