Ezri moved back to the same place Jadzia lived and worked and associated with the same people Jadzia did. From what "Rejoined" establishes, that violates the symbiont having new experiences and should have never been allowed. Now, I can buy that perhaps the symbiosis commision was leniant on Ezri because of her lack of training. But it's definitely an inconsistency.
In "Rejoined" everyone was freaking out at the idea of Lenara and Jadzia even being on the station at the same time. Lenara's brother watches them like a hawk. Sisko offers for Jadzia to take a leave of absense. Fast forward to Ezri's arrival and no one bats an eye about her being around all these people from her past life on a daily basis, including her husband.