Can't summon potions in chests

Lately I've been trying to summon a chest with a healing potion in it and come up empty. It replaces a chest already there, but doesn't appear to contain a potion. Here's an example code:

summon FallingSand ~ ~ ~ {TileID:54,Time:0.9,TileEntityData:{Items:[{id:potion:8197,Slot:13,Count:1}]}}