Normal chests are causing redstone updates to dispensers and droppers in the same fashion as trapped chests which also appears to be the underlying cause of the bug described in MC-10174.
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kumasasa
That's more a duplicate of MC-846
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MC-846 describes the well known bug where a dispenser will fire when a block near it receives a redstone update. The point of this bug report is that normal chests are not supposed to be causing redstone updates because that's what the trapped chest is supposed to do. It's specific to normal chests since this update does not occur when other non-redstone powered blocks are placed in the area.
kumasasa
Please retest tomorrow with snapshot 13w10b if this issue may be co-fixed with MC-846