There are a number of issues with armors/weapons clipping. People have been complaining for a long time. These were just a couple I had experienced recently.
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On Pandaren Monk… the Monk Legion artifact (Monkey King) goes straight through shoulder armor and bounces around inside when walking.
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On Blood Elf Paladin… the new Hallowfall armor is really bad. Hands/weapons go straight through the sides of the armor when standing still.