Clipping mask for a layer doesn’t move when dragged in real-time render mode
If you move art with its layer-level clipping mask, Ai will draw it as if you move the art without the clipping mask. See the GIF attached.
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A similar looking problem happens if you combine ab opacity mask with a live effect for an object:
http://illustrator.uservoice.com/forums/601447/suggestions/47229830