Similar bug, and another mage in guild said same thing happened: 
 
Had some dimensional pockets from my last login's grind. They were still in inventory when I logged in multiple days later. I could open them, though I did not attempt to pick them up or put anything in them or drop them. I asked guild and guildy said "same thing happened to me, but don't put anything in them because they poof after a while" Not sure if he meant zoning. 
 
I logged off to come post this here and to avoid possible crashing/bugging. 
		
		
		
		
		
		
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