It had submitted it as a bug previously in hopes a fix would be found, however it doesn’t seem to be the case. As I’m not well versed in the art pipelines, I couldn’t get the retargeting to work appropriately for MH rigs either. There must be something that was missed in the targeting configuration that could alleviate this, or something that could be done externally, since most rigs I create manually in Blender retarget with no issue. I’ll give it a look with fresh eyes though!