Financing a SFR Already Rented

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Hi all!  I am looking to purchase a house in the Dallas, TX area with conventional financing and 20% down as a primary resident (rent it out in the future).  I've already been preapproved by the lender.  I then ran across a house for sale that is already rented out on a recent 2 year lease with 18+ months remaining.  If I pursue this property, will the lender care or find out that this is currently a rental property?  or will this be a deal breaker for the lower rates that come with financing as primary resident?  Any feedback and suggestions you have will be greatly appreciated!