So, this bug is weird, every time I import anything in the scene with RRM rig ( lets say the scene that I'm using for animation ) skin cluster gets detached from the character and yea, no fix for this that I know of atm. Only thing i can do is do the skinning again
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I haven't experienced any issues with importing. Does this also happen with file referencing? Or only importing? Are there any errors? Is there still a skinCluster node on the geometry, or is it completely gone? Also, just out of curiousity, why are you importing instead of referencing your RRM rigs?