Yes even if it is kept on auto reinvestment, there is a maturity amt provided and maturity period even though you are opting for reinvestment. And the same needs to be considered either on accrual basis or on maturity I.e likely maturity.
For that you can check it very easily by getting balance and interest certificate for the month whether how is the interest credited.
Eg: If an FD is created for a period of 1 year in 1 st July 15 and have opted for reinvestment option, then interest can be taken either for said year on 30 June 16 or interest for current period up to 31 march 16 is to taken as income from other sources. In any case, it should be either on 31 march and 30 June respectively for 2 ay or directly on maturity date I.e 30 June. But in any case it needs to be shown for the ay.
It cannot be that since the assessee has opted for reinvestment, that interest is not to be recognized.