I thought of this, too. When you go strictly by the rules, you are right, I think. Temporary aspects need fate points, too after the first tagging.
So, either you push rules aside when it makes no senso to you - you could even decide this differently from scene to scene - or you try to be creative. In your scenario, the bad guys can sprint around the furniture. Or, after the first round, they simply have adapted and shoot through it (I don't think a normal piece of furniture can withstand bullets) and a dodge roll is interpreted as leaving the cover.