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Apologies if this has already been fixed in a newer revision (I'm getting timeouts atm when trying to download a fresh copy of the texture pack; I'm hoping this is temporary, if not I'll post more details in that thread about trouble downloading the pack), but I didn't see another thread about this or anything in the changelog saying it had been changed.
Pickaxe in main hand, shovel in off-hand, 1st person view:
3rd person view:
Shovel in main hand, pickaxe in off-hand (for comparison), 1st person view:
3rd person view: